Substituted imidazopyridinyl-aminopyridine compounds

ABSTRACT

The present invention relates to substituted imidazopyridinyl-aminopyridine compounds and methods of synthesizing these compounds. The present invention also relates to pharmaceutical compositions containing substituted imidazopyridinyl-aminopyridine compounds and methods of treating cell proliferative disorders, such as cancer, by administering these compounds and pharmaceutical compositions to subjects in need thereof.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 13/529,459, filed Jun. 21, 2012, which claims priority to, and the benefit of, U.S. Ser. No. 61/500,889, filed Jun. 24, 2011. The contents of each of these applications are incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION

Cancer is the second leading cause of death in the United States, exceeded only by heart disease. (Cancer Facts and Figures 2004, American Cancer Society, Inc.). Despite recent advances in cancer diagnosis and treatment, surgery and radiotherapy may be curative if a cancer is found early, but current drug therapies for metastatic disease are mostly palliative and seldom offer a long-term cure. Even with new chemotherapies entering the market, the need continues for new drugs effective in monotherapy or in combination with existing agents as first line therapy, and as second and third line therapies in treatment of resistant tumors.

Cancer cells are by definition heterogeneous. For example, within a single tissue or cell type, multiple mutational “mechanisms” may lead to the development of cancer. As such, heterogeneity frequently exists between cancer cells taken from tumors of the same tissue and same type that have originated in different individuals. Frequently observed mutational “mechanisms” associated with some cancers may differ between one tissue type and another (e.g., frequently observed mutational “mechanisms” leading to colon cancer may differ from frequently observed “mechanisms” leading to leukemias). It is therefore often difficult to predict whether a particular cancer will respond to a particular chemotherapeutic agent (Cancer Medicine, 5^(th) edition, Bast et al., B. C. Decker Inc., Hamilton, Ontario).

Components of cellular signal transduction pathways that regulate the growth and differentiation of normal cells can, when dysregulated, lead to the development of cellular proliferative disorders and cancer. Mutations in cellular signaling proteins may cause such proteins to become expressed or activated at inappropriate levels or at inappropriate times during the cell cycle, which in turn may lead to uncontrolled cellular growth or changes in cell-cell attachment properties. For example, dysregulation of receptor tyrosine kinases by mutation, gene rearrangement, gene amplification, and overexpression of both receptor and ligand has been implicated in the development and progression of human cancers.

AKT protein family, which members are also called protein kinases B (PKB) plays an important role in mammalian cellular signaling. In humans, there are three genes in the AKT family: Akt1, Akt2, and Akt3. These genes code for enzymes that are members of the serine/threonine-specific protein kinase family. Akt1 is involved in cellular survival pathways, by inhibiting apoptotic processes. Akt1 is also able to induce protein synthesis pathways, and is therefore a key signaling protein in the cellular pathways that lead to skeletal muscle hypertrophy, and general tissue growth. Akt2 is an important signaling molecule in the Insulin signaling pathway and is required to induce glucose transport. The role of Akt3 is less clear, though it appears to be predominantly expressed in brain.

The AKT family regulates cellular survival and metabolism by binding and regulating many downstream effectors, e.g. Nuclear Factor-κB, Bcl-2 family proteins and murine double minute 2 (MDM2). Akt1 is known to play a role in the cell cycle. Moreover, activated Akt1 may enable proliferation and survival of cells that have sustained a potentially mutagenic impact and, therefore, may contribute to acquisition of mutations in other genes. Akt1 has also been implicated in angiogenesis and tumor development. Studies have shown that deficiency of Akt1 enhanced pathological angiogenesis and tumor growth associated with matrix abnormalities in skin and blood vessels. Since it can block apoptosis, and thereby promote cell survival, Akt1 is a major factor in many types of cancer.

Accordingly, new compounds and methods for modulating AKT genes, proteins and treating proliferation disorders, including cancer, are needed. The present invention addresses these needs.

SUMMARY OF THE INVENTION

The present invention provides, in part, substituted imidazopyridinyl-aminopyridine compounds of formula I or II, and methods of preparing the compounds of formula I or II:

wherein:

X is NR_(N)R_(N)′, OR_(O), SR_(S) or

wherein

is linked to the imidazopyridinyl ring at the position indicated by “**”;

R_(O) and R_(S) are each independently unsubstituted or substituted C₆-C₁₀ aryl;

R_(N) is (CH₂)_(m)R_(hc) or unsubstituted or substituted C₆-C₁₀ aryl;

R_(N)′ is H; or

R_(N) and R_(N)′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted morpholine;

m is 1, 2, 3 or 4;

R_(hc) is unsubstituted or substituted heterocycle comprising one 6-member ring and 1 or 2 heteroatoms selected from N, O and S;

R_(ph) is substituted C₃-C₆ alkyl or unsubstituted C₄-C₆ alkyl;

R₁ is (CH₂)_(o)—OH or C(O)R₂;

R₁′ is H; or

R₁ and R₁′, together with the nitrogen atom to which they are attached, form a ring selected from

wherein the nitrogen atom indicated by “**” is the nitrogen atom to which R₁ and R₁′ are attached;

o is 1, 2, 3 or 4;

R₂ is

tert-butyl, unsubstituted or substituted C₃-C₈ carbocycle or unsubstituted or substituted heterocycle comprising one 6-member ring and 1 or 2 heteroatoms selected from N, O and S;

n is 0, 1, 2 or 3;

R₁₀ is H, unsubstituted or substituted C₁-C₆ alkyl or C(O)R₁₁;

R₁₁ is unsubstituted or substituted C₁-C₆ alkyl;

R_(C) and R_(C)′, for each occurrence, are independently H or unsubstituted methyl;

R₃ is NR₁₂R₁₂′, C(O)NR₆R₆′, NR₇′C(O)R₇ or NR₇′S(O)₂R₇;

R₆ and R₆′ are each independently H or unsubstituted or substituted C₁-C₆ alkyl, or R₆ and R₆′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted heterocycle comprising one 5- or 6-member ring and optionally 1 or 2 additional heteroatoms selected from N, O and S;

R₇ is unsubstituted or substituted C₁-C₆ alkyl;

R₇′ is H or unsubstituted or substituted C₁-C₆ alkyl;

R₁₂ and R₁₂′ are each H, or R₁₂ and R₁₂′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted heterocycle comprising one 6-member ring and optionally 1 or 2 additional heteroatoms selected from N, O and S;

R₄ is C(O)R₈ or S(O)₂R_(r);

R_(r) is unsubstituted or substituted C₁-C₆ alkyl;

R₈ is unsubstituted or substituted C₂-C₆ alkyl or unsubstituted or substituted C₃-C₈ carbocycle;

R₅ and R₅′ are each independently H, unsubstituted or substituted C₁-C₆ alkyl or C(O)NR₉R₉′, provided that R₅ and R₅′ are not both H;

R₉ and R₉′ are each independently H or unsubstituted or substituted C₁-C₆ alkyl;

R_(aza) is H or OH;

R_(p) is C(O)NR_(q)R_(q)′; and

R_(q) and R_(q)′ are each independently H or unsubstituted or substituted C₁-C₆ alkyl.

The present invention also provides pharmaceutical compositions comprising one or more compounds of each of the formulae described herein and one or more pharmaceutically acceptable carriers.

The present invention also provides methods of treating a cell proliferative disorder by administering to a subject in need thereof, a therapeutically effective amount of a compound of each of the formulae described herein, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, in combination with a pharmaceutically acceptable carrier, such that the disorder is treated.

The present invention also provides methods of treating cancer by administering to a subject in need thereof, a therapeutically effective amount of a compound of each of the formulae described herein, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, in combination with a pharmaceutically acceptable carrier, such that the cancer is treated.

The present invention also provides methods of selectively inducing cell death in precancerous or cancerous cells by contacting a cell with an effective amount of a compound of each of the formulae described herein, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, in combination with a pharmaceutically acceptable carrier, such that contacting the cell results in selective induction of cell death in the precancerous or cancer cells.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the specification, the singular forms also include the plural unless the context clearly dictates otherwise. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference. The references cited herein are not admitted to be prior art to the claimed invention. In the case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and are not intended to be limiting.

Other features and advantages of the invention will be apparent from the following detailed description and claims.

DETAILED DESCRIPTION OF THE INVENTION 1. Substituted Imidazopyridinyl-Aminopyridine Compounds

The present invention provides novel substituted imidazopyridinyl-aminopyridine compounds, synthetic methods for making the compounds, pharmaceutical compositions containing them and various uses of the disclosed compounds.

The present invention provides the compounds of formula I:

wherein:

X is NR_(N)R_(N)′, OR_(O), SR_(S) or

wherein

is linked to the imidazopyridinyl ring at the position indicated by “**”;

R_(O) and R_(S) are each independently unsubstituted or substituted C₆-C₁₀ aryl;

R_(N) is (CH₂)_(m)R_(hc) or unsubstituted or substituted C₆-C₁₀ aryl;

R_(N)′ is H; or

R_(N) and R_(N)′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted morpholine;

m is 1, 2, 3 or 4;

R_(hc) is unsubstituted or substituted heterocycle comprising one 6-member ring and 1 or 2 heteroatoms selected from N, O and S; and

R_(ph) is substituted C₃-C₆ alkyl or unsubstituted C₄-C₆ alkyl.

For example, X is NR_(N)R_(N)′.

For example, R_(N)′ is H and R_(N) is (CH₂)_(m)R_(hc).

For example, m is 1 or 2 and R_(hc) is heterocycle selected from pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, and morpholinyl. For example, m is 2 and R_(hc) is morpholinyl.

For example, R_(N)′ is H and R_(N) is unsubstituted phenyl.

For example, R_(N)′ is H and R_(N) is phenyl substituted with one or more groups, each of which is independently selected from hydroxyl, halogen (e.g., fluorine, chlorine, bromine and iodine), cyano, nitro, unsubstituted or substituted amino (e.g., amino, C₁-C₆ alkylamino and di-C₁-C₆ alkylamino), unsubstituted or substituted C₁-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl), unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, n-propyloxy, i-propyloxy, n-butoxy, and t-butoxy), and heterocycle comprising one 5- or 6-member ring and 1-3 heteroatoms selected from N, O and S (e.g., pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, and morpholinyl).

For example, R_(N)′ is H and R_(N) is phenyl substituted at the ortho-, meta- or para-position.

For example, R_(N)′ is H and R_(N) is phenyl substituted with morpholinyl at the ortho-position, morpholinyl at the meta-position or morpholinyl at the para-position.

For example, R_(N) and R_(N)′, together with the nitrogen atom to which they are attached, form an unsubstituted morpholine.

For example, R_(N) and R_(N)′, together with the nitrogen atom to which they are attached, form a morpholine substituted with one or more groups, each of which is independently selected from hydroxyl, halogen (e.g., fluorine, chlorine, bromine and iodine), cyano, nitro, unsubstituted or substituted amino (e.g., amino, C₁-C₆ alkylamino and di-C₁-C₆ alkylamino), unsubstituted or substituted C₁-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl), and unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, n-propyloxy, i-propyloxy, n-butoxy, and t-butoxy).

For example, X is OR_(O).

For example, R_(O) is unsubstituted phenyl.

For example, R_(O) is phenyl substituted with one or more groups, each of which is independently selected from hydroxyl, halogen (e.g., fluorine, chlorine, bromine and iodine), cyano, nitro, unsubstituted or substituted amino (e.g., amino, C₁-C₆ alkylamino and di-C₁-C₆ alkylamino), unsubstituted or substituted C₁-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl), unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, n-propyloxy, i-propyloxy, n-butoxy, and t-butoxy), and heterocycle comprising one 5- or 6-member ring and 1-3 heteroatoms selected from N, O and S (e.g., pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, and morpholinyl).

For example, X is SR_(S).

For example, R_(S) is unsubstituted phenyl.

For example, R_(S) is phenyl substituted with one or more groups, each of which is independently selected from hydroxyl, halogen (e.g., fluorine, chlorine, bromine and iodine), cyano, nitro, unsubstituted or substituted amino (e.g., amino, C₁-C₆ alkylamino and di-C₁-C₆ alkylamino), unsubstituted or substituted C₁-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl), unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, n-propyloxy, i-propyloxy, n-butoxy, and t-butoxy), and heterocycle comprising one 5- or 6-member ring and 1-3 heteroatoms selected from N, O and S (e.g., pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, and morpholinyl).

For example, X is

For example, R_(ph) is substituted straight-chain or branched C₃-C₆ alkyl, including but not limited to, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is substituted. For example, R_(ph) is unsubstituted straight-chain or branched C₄-C₆ alkyl, including but not limited to, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl. For example, R_(ph) is t-butyl or substituted n-propyl. For example, R_(ph) is 2-hydroxypropyl.

The present invention also provides the compounds of formula II:

wherein:

R₁ is (CH₂)_(o)—OH or C(O)R₂;

R₁′ is H; or

R₁ and R₁′, together with the nitrogen atom to which they are attached, form a ring selected from

wherein the nitrogen atom indicated by “**” is the nitrogen atom to which R₁ and R₁′ are attached;

o is 1, 2, 3 or 4;

R₂ is

tert-butyl, unsubstituted or substituted C₃-C₈ carbocycle or unsubstituted or substituted heterocycle comprising one 6-member ring and 1 or 2 heteroatoms selected from N, O and S;

n is 0, 1, 2 or 3;

R₁₀ is H, unsubstituted or substituted C₁-C₆ alkyl or C(O)R₁₁;

R₁₁ is unsubstituted or substituted C₁-C₆ alkyl;

R_(C) and R_(C)′, for each occurrence, are independently H or unsubstituted methyl;

R₃ is NR₁₂R₁₂′, C(O)NR₆R₆′, NR₇′(O)R₇ or NR₇′S(O)₂R₇;

R₆ and R₆′ are each independently H or unsubstituted or substituted C₁-C₆ alkyl, or R₆ and R₆′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted heterocycle comprising one 5- or 6-member ring and optionally 1 or 2 additional heteroatoms selected from N, O and S;

R₇ is unsubstituted or substituted C₁-C₆ alkyl;

R₇′ is H or unsubstituted or substituted C₁-C₆ alkyl;

R₁₂ and R₁₂′ are each H, or R₁₂ and R₁₂′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted heterocycle comprising one 6-member ring and optionally 1 or 2 additional heteroatoms selected from N, O and S;

R₄ is C(O)R₈ or S(O)₂R_(r);

R_(r) is unsubstituted or substituted C₁-C₆ alkyl;

R₈ is unsubstituted or substituted C₂-C₆ alkyl or unsubstituted or substituted C₃-C₈ carbocycle;

R₅ and R₅′ are each independently H, unsubstituted or substituted C₁-C₆ alkyl or C(O)NR₉R₉′, provided that R₅ and R₅′ are not both H; and

R₉ and R₉′ are each independently H or unsubstituted or substituted C₁-C₆ alkyl; and

R_(aza) is H or OH;

R_(p) is C(O)NR_(q)R_(q)′; and

R_(q) and R_(q)′ are each independently H or unsubstituted or substituted C₁-C₆ alkyl.

For example, R₁′ is H and R₁ is (CH₂)_(o)—OH.

For example, o is 2, 3 or 4.

For example, o is 2.

For example, R₁′ is H and R₁ is C(O)R₂.

For example, R₂ is

For example, n is 0 and R₁₀ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R₁₀ is methyl.

For example, n is 1 and R_(C) and R_(C)′ are each methyl.

For example, R₁₀ is H.

For example, R₁₀ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R₁₀ is methyl.

For example, R₁₀ is C(O)R₁₁ and R₁₁ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R₁₁ is methyl.

For example, R₂ is tert-butyl.

For example, R₂ is unsubstituted or substituted C₃-C₈ carbocycle, including but not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. For example, R₂ is cyclopropyl.

For example, R₂ is unsubstituted or substituted heterocycle selected from pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, morpholinyl, tetrahydropyranyl, and dioxanyl. For example, R₂ is tetrahydropyranyl or 1,4-dioxanyl.

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, R₃ is NR₁₂R₁₂′.

For example, R₁₂ and R₁₂′ are each H.

For example, R₁₂ and R₁₂′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted heterocycle selected from pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, and morpholinyl. For example, R₁₂ and R₁₂′, together with the nitrogen atom to which they are attached, form a morpholinyl.

For example, R₃ is C(O)NR₆R₆′.

For example, R₆ and R₆′ are not both H.

For example, R₆′ is H and R₆ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted with one or more groups independently selected from hydroxyl and unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, propyloxy, i-propyloxy, butoxy, and t-butoxy).

For example, R₆′ is H and R₆ is methyl, ethyl, propyl, i-propyl or ethyl substituted with methoxy.

For example, R₆′ and R₆ are each independently unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted with one or more groups independently selected from hydroxyl and unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, propyloxy, propyloxy, butoxy, and t-butoxy).

For example, R₆′ and R₆ are each methyl. For example, R₆′ and R₆ are each ethyl.

For example, R₆ and R₆′, together with the nitrogen atom to which they are attached, form a heterocycle selected from piperidine, piperazine and morpholine. For example, R₆ and R₆′, together with the nitrogen atom to which they are attached, form a morpholine.

For example, R₃ is NR₇′C(O)R₇.

For example, R₇′ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl (e.g., methyl, ethyl, n-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl), and R₇ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted with one or more groups independently selected from hydroxyl and unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, propyloxy, i-propyloxy, butoxy, and t-butoxy)). For example, R₇′ is methyl and R₇ is methyl.

For example, R₇′ is H and R₇ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted with one or more groups independently selected from hydroxyl and unsubstituted or substituted C₁-C₆ alkoxy (e.g., methoxy, ethoxy, propyloxy, i-propyloxy, butoxy, and t-butoxy)). For example, R₇ is methyl or methyl substituted with methoxy.

For example, R₃ is NR₇′S(O)₂R₇.

For example, R₇′ is H, and R₇ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl (e.g., methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl). For example, R₇ is methyl.

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, R₄ is C(O)R₈.

For example, R₈ is unsubstituted or substituted, straight chain C₂-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R₈ is ethyl, i-propyl or t-butyl.

For example, R₈ is unsubstituted or substituted C₃-C₈ carbocycle, including but not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. For example, R₈ is cyclopropyl.

For example, R₄ is S(O)₂R_(r).

For example, R_(r) is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R_(r) is methyl.

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, R₅′ and R₅ are each independently unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted with one or more hydroxyl. For example, R₅′ R₅ are each methyl or methyl substituted with hydroxyl.

For example, R₅′ is H and R₅ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R₅′ is H and R₅ is methyl substituted with hydroxyl.

For example, R₅′ is H and R₅ is C(O)NR₉R₉′.

For example, R₉′ and R₉ are each independently unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R₉′ and R₉ are each methyl.

For example, R₉′ is H and R₉ is unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted.

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, R_(aza) is OH.

For example, R₁ and R₁′, together with the nitrogen atom to which they are attached, form

For example, only one of R_(q) and R_(q)′ is H. For example, R_(q)′ is H and R_(q) is methyl.

For example, R_(q) and R_(q)′ are each independently unsubstituted or substituted, straight chain C₁-C₆ alkyl or branched C₃-C₆ alkyl, including but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl, and n-hexyl, each of which is optionally substituted. For example, R_(q) and R_(q)′ are each methyl.

Representative compounds of the present invention include compounds listed in Table 1.

TABLE 1 Cmpd Structure Chemical Name 1

3-(3-(4-(1- aminocyclobutyl)phenyl)-5- morpholino-3H-imidazo[4,5- b]pyridin-2-yl)pyridin-2-amine 2

1-(3-{3-[4-(1- Aminocyclobutyl)phenyl]-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl}phenyl)-N,N- dimethylpyrrolidine-3- carboxamide trihydrochloride 3

N-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)cyclopropanecarbox- amide 4

N-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)pivalamide 5

1-((3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)amino)-2-methyl-1- oxopropan-2-yl acetate 6

N-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-2-hydroxy-2- methylpropanamide 7

(S)-3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5-yl)-N- (2-hydroxypropyl)benzamide 8

(R)-3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5-yl)-N- (2-hydroxypropyl)benzamide 9

1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N,N- dimethylpiperidine-4- carboxamide 10

1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N,N- diethylpiperidine-4- carboxamide 11

(1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperidin-4- yl)(morpholino)methanone 12

N-(1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperidin-4- yl)acetamide 13

1-(4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperazin-1- yl)propan-1-one 14

(4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperazin-1- yl)(cyclopropyl)methanone 15

1-(4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperazin-1-yl)-2- methylpropan-1-one 16

1-(4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperazin-1-yl)-2,2- dimethylpropan-1-one 17

3-(3-(4-(1- aminocyclobutyl)phenyl)-5-(3- ((2S,6R)-2,6- dimethylmorpholino)phenyl)- 3H-imidazo[4,5-b]pyridin-2- yl)pyridin-2-amine 18

4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)thiomorpholine 1,1- dioxide 19

3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-N-phenyl- 3H-imidazo[4,5-b]pyridin-5- amine 20

3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-N-(4- morpholinophenyl)-3H- imidazo[4,5-b]pyridin-5-amine 21

3-(3-(4-(1- aminocyclobutyl)phenyl)-5- (phenylthio)-3H-imidazo[4,5- b]pyridin-2-yl)pyridin-2-amine 22

3-(3-(4-(1- aminocyclobutyl)phenyl)-5- phenoxy-3H-imidazo[4,5- b]pyridin-2-yl)pyridin-2-amine 23

1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N-(2- methoxyethyl)piperidine-4- carboxamide 24

1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N-ethylpiperidine-4- carboxamide 25

1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N-methylpiperidine- 4-carboxamide 26

N-(1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperidin-4-yl)-2- methoxyacetamide 27

4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N,N- dimethylmorpholine-2- carboxamide 28

1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-N- isopropylpiperidine-4- carboxamide 29

(R)-(4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)morpholin-2- yl)methanol 30

(S)-(4-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)morpholin-2- yl)methanol 31

3-(5-(3-(8-oxa-3- azabicyclo[3.2.1]octan-3- yl)phenyl)-3-(4-(1- aminocyclobutyl)phenyl)-3H- imidazo[4,5-b]pyridin-2- yl)pyridin-2-amine 32

3-(3-(4-(1- aminocyclobutyl)phenyl)-5-(3- (4-aminopiperidin-1-yl)phenyl)- 3H-imidazo[4,5-b]pyridin-2- yl)pyridin-2-amine 33

N-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-1,4-dioxane-2- carboxamide 34

N-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)tetrahydro-2H-pyran- 4-carboxamide 35

3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5-yl)-N- (tert-butyl)benzamide 36

methyl (3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)carbamate 37

N-(1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperidin-4- yl)methanesulfonamide 38

N-(1-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)piperidin-4-yl)-N- methylacetamide 39

2-((3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)amino)ethanol 40

3-(3-(4-(1- aminocyclobutyl)phenyl)-5-(3- (4-morpholinopiperidin-1- yl)phenyl)-3H-imidazo[4,5- b]pyridin-2-yl)pyridin-2-amine 41

3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-N-(3- morpholinophenyl)-3H- imidazo[4,5-b]pyridin-5-amine 42

3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-N-(2- morpholinophenyl)-3H- imidazo[4,5-b]pyridin-5-amine 43

(1R,3r,5S)-8-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-8- azabicyclo[3.2.1]octan-3-ol 44

3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-N-(2- morpholinoethyl)-3H- imidazo[4,5-b]pyridin-5-amine 45

N-(3-(3-(4-(1- aminocyclobutyl)phenyl)-2-(2- aminopyridin-3-yl)-3H- imidazo[4,5-b]pyridin-5- yl)phenyl)-2-methoxy-2- methylpropanamide 46

3-(3-[4-(1- aminocyclobutyl)phenyl]-5-{3- [4-(methylsulfonyl)piperazin-1- yl]phenyl}-3H-imidazo[4,5- b]pyridin-2-yl)pyridin-2-amine hydrochloride

As used herein, “alkyl”, “C₁, C₂, C₃, C₄, C₅ or C₆ alkyl” or “C₁-C₆ alkyl” is intended to include C₁, C₂, C₃, C₄, C₅ or C₆ straight chain (linear) saturated aliphatic hydrocarbon groups and C₃, C₄, C₅ or C₆ branched saturated aliphatic hydrocarbon groups. For example, C₁-C₆ alkyl is intended to include C₁, C₂, C₃, C₄, C₅ and C₆ alkyl groups. Examples of alkyl include, moieties having from one to six carbon atoms, such as, but not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, t-butyl, n-pentyl, s-pentyl or n-hexyl.

In certain embodiments, a straight chain or branched alkyl has six or fewer carbon atoms (e.g., C₁-C₆ for straight chain, C₃-C₆ for branched chain), and in another embodiment, a straight chain or branched alkyl has four or fewer carbon atoms.

“Heteroalkyl” groups are alkyl groups, as defined above, that have an oxygen, nitrogen, sulfur or phosphorous atom replacing one or more hydrocarbon backbone carbon atoms.

As used herein, the term “cycloalkyl”, “C₃, C₄, C₅, C₆, C₇ or C₈ cycloalkyl” or “C₃-C₈ cycloalkyl” is intended to include hydrocarbon rings having from three to eight carbon atoms in their ring structure. In one embodiment, a cycloalkyl group has five or six carbons in the ring structure.

The term “substituted alkyl” refers to alkyl moieties having substituents replacing one or more hydrogen atoms on one or more carbons of the hydrocarbon backbone. Such substituents can include, for example, alkyl, alkenyl, alkynyl, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, amino (including alkylamino, dialkylamino, arylamino, diarylamino and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), amidino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moiety. Cycloalkyls can be further substituted, e.g., with the substituents described above. An “alkylaryl” or an “aralkyl” moiety is an alkyl substituted with an aryl (e.g., phenylmethyl (benzyl)).

Unless the number of carbons is otherwise specified, “lower alkyl” includes an alkyl group, as defined above, having from one to six, or in another embodiment from one to four, carbon atoms in its backbone structure. “Lower alkenyl” and “lower alkynyl” have chain lengths of, for example, two to six or of two to four carbon atoms.

As used herein, “alkyl linker” is intended to include C₁, C₂, C₃, C₄, C₅ or C₆ straight chain (linear) saturated aliphatic hydrocarbon groups and C₃, C₄, C₅ or C₆ branched saturated aliphatic hydrocarbon groups. For example, C₁-C₆ alkyl linker is intended to include C₁, C₂, C₃, C₄, C₅ and C₆ alkyl linker groups. Examples of alkyl linker include, moieties having from one to six carbon atoms, such as, but not limited to, methyl (—CH₂—), ethyl (—CH₂CH₂—), n-propyl (—CH₂CH₂CH₂—), i-propyl (—CHCH₃CH₂—), n-butyl (—CH₂CH₂CH₂CH₂—), s-butyl (—CHCH₃CH₂CH₂—), i-butyl (—C(CH₃)₂CH₂—), n-pentyl (—CH₂CH₂CH₂CH₂CH₂—), s-pentyl (—CHCH₃CH₂CH₂CH₂—) or n-hexyl (—CH₂CH₂CH₂CH₂CH₂CH₂—).

“Alkenyl” includes unsaturated aliphatic groups analogous in length and possible substitution to the alkyls described above, but that contain at least one double bond. For example, the term “alkenyl” includes straight chain alkenyl groups (e.g., ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl), branched alkenyl groups, cycloalkenyl (e.g., alicyclic) groups (e.g., cyclopropenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl), alkyl or alkenyl substituted cycloalkenyl groups, and cycloalkyl or cycloalkenyl substituted alkenyl groups. In certain embodiments, a straight chain or branched alkenyl group has six or fewer carbon atoms in its backbone (e.g., C₂-C₆ for straight chain, C₃-C₆ for branched chain). Likewise, cycloalkenyl groups may have from five to eight carbon atoms in their ring structure, and in one embodiment, cycloalkenyl groups have five or six carbons in the ring structure. The term “C₂-C₆” includes alkenyl groups containing two to six carbon atoms. The term “C₃-C₆” includes alkenyl groups containing three to six carbon atoms.

“Heteroalkenyl” includes alkenyl groups, as defined herein, having an oxygen, nitrogen, sulfur or phosphorous atom replacing one or more hydrocarbon backbone carbons.

The term “substituted alkenyl” refers to alkenyl moieties having substituents replacing one or more hydrogen atoms on one or more hydrocarbon backbone carbon atoms. Such substituents can include, for example, alkyl, alkenyl, alkynyl, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, amino (including alkylamino, dialkylamino, arylamino, diarylamino and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), amidino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moiety.

“Alkynyl” includes unsaturated aliphatic groups analogous in length and possible substitution to the alkyls described above, but which contain at least one triple bond. For example, “alkynyl” includes straight chain alkynyl groups (e.g., ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl), branched alkynyl groups, and cycloalkyl or cycloalkenyl substituted alkynyl groups. In certain embodiments, a straight chain or branched alkynyl group has six or fewer carbon atoms in its backbone (e.g., C₂-C₆ for straight chain, C₃-C₆ for branched chain). The term “C₂-C₆” includes alkynyl groups containing two to six carbon atoms. The term “C₃-C₆” includes alkynyl groups containing three to six carbon atoms.

“Heteroalkynyl” includes alkynyl groups, as defined herein, having an oxygen, nitrogen, sulfur or phosphorous atom replacing one or more hydrocarbon backbone carbons.

The term “substituted alkynyl” refers to alkynyl moieties having substituents replacing one or more hydrogen atoms on one or more hydrocarbon backbone carbon atoms. Such substituents can include, for example, alkyl, alkenyl, alkynyl, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, amino (including alkylamino, dialkylamino, arylamino, diarylamino and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), am idino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moiety.

“Aryl” includes groups with aromaticity, including “conjugated”, or multicyclic, systems with at least one aromatic ring. Examples include phenyl, benzyl, etc.

“Heteroaryl” groups are aryl groups, as defined above, having from one to four heteroatoms in the ring structure, and may also be referred to as “aryl heterocycles” or “heteroaromatics”. As used herein, the term “heteroaryl” is intended to include a stable 5-, 6-, or 7-membered monocyclic or 7-, 8-, 9-, 10-, 11- or 12-membered bicyclic aromatic heterocyclic ring which consists of carbon atoms and one or more heteroatoms, e.g., 1 or 1-2 or 1-3 or 1-4 or 1-5 or 1-6 heteroatoms, independently selected from the group consisting of nitrogen, oxygen and sulfur. The nitrogen atom may be substituted or unsubstituted (i.e., N or NR wherein R is H or other substituents, as defined). The nitrogen and sulfur heteroatoms may optionally be oxidized (i.e., N→O and S(O)_(p), where p=1 or 2). It is to be noted that total number of S and O atoms in the aromatic heterocycle is not more than 1.

Examples of heteroaryl groups include pyrrole, furan, thiophene, thiazole, isothiazole, imidazole, triazole, tetrazole, pyrazole, oxazole, isoxazole, pyridine, pyrazine, pyridazine, pyrimidine, and the like.

Furthermore, the terms “aryl” and “heteroaryl” include multicyclic aryl and heteroaryl groups, e.g., tricyclic, bicyclic, e.g., naphthalene, benzoxazole, benzodioxazole, benzothiazole, benzoimidazole, benzothiophene, methylenedioxyphenyl, quinoline, isoquinoline, naphthridine, indole, benzofuran, purine, benzofuran, deazapurine, indolizine.

In the case of multicyclic aromatic rings, only one of the rings needs to be aromatic (e.g., 2,3-dihydroindole), although all of the rings may be aromatic (e.g., quinoline). The second ring can also be fused or bridged.

The aryl or heteroaryl aromatic ring can be substituted at one or more ring positions with such substituents as described above, for example, alkyl, alkenyl, akynyl, halogen, hydroxyl, alkoxy, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, alkylaminocarbonyl, aralkylaminocarbonyl, alkenylaminocarbonyl, alkylcarbonyl, arylcarbonyl, aralkylcarbonyl, alkenylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylthiocarbonyl, phosphate, phosphonato, phosphinato, amino (including alkylamino, dialkylamino, arylamino, diarylamino and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), amidino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moiety. Aryl groups can also be fused or bridged with alicyclic or heterocyclic rings, which are not aromatic so as to form a multicyclic system (e.g., tetralin, methylenedioxyphenyl).

As used herein, “carbocycle” or “carbocyclic ring” is intended to include any stable monocyclic, bicyclic or tricyclic ring having the specified number of carbons, any of which may be saturated, unsaturated, or aromatic. For example, a C₃-C₁₄ carbocycle is intended to include a monocyclic, bicyclic or tricyclic ring having 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14 carbon atoms. Examples of carbocycles include, but are not limited to, cyclopropyl, cyclobutyl, cyclobutenyl, cyclopentyl, cyclopentenyl, cyclohexyl, cycloheptenyl, cycloheptyl, cycloheptenyl, adamantyl, cyclooctyl, cyclooctenyl, cyclooctadienyl, fluorenyl, phenyl, naphthyl, indanyl, adamantyl and tetrahydronaphthyl. Bridged rings are also included in the definition of carbocycle, including, for example, [3.3.0]bicyclooctane, [4.3.0]bicyclononane, [4.4.0]bicyclodecane and [2.2.2]bicyclooctane. A bridged ring occurs when one or more carbon atoms link two non-adjacent carbon atoms. In one embodiment, bridge rings are one or two carbon atoms. It is noted that a bridge always converts a monocyclic ring into a tricyclic ring. When a ring is bridged, the substituents recited for the ring may also be present on the bridge. Fused (e.g., naphthyl, tetrahydronaphthyl) and spiro rings are also included.

As used herein, “heterocycle” includes any ring structure (saturated or partially unsaturated) which contains at least one ring heteroatom (e.g., N, O or S). Examples of heterocycles include, but are not limited to, morpholine, pyrrolidine, tetrahydrothiophene, piperidine, piperazine and tetrahydrofuran.

Examples of heterocyclic groups include, but are not limited to, acridinyl, azocinyl, benzimidazolyl, benzofuranyl, benzothiofuranyl, benzothiophenyl, benzoxazolyl, benzoxazolinyl, benzthiazolyl, benztriazolyl, benztetrazolyl, benzisoxazolyl, benzisothiazolyl, benzimidazolinyl, carbazolyl, 4aH-carbazolyl, carbolinyl, chromanyl, chromenyl, cinnolinyl, decahydroquinolinyl, 2H,6H-1,5,2-dithiazinyl, dihydrofuro[2,3-b]tetrahydrofuran, furanyl, furazanyl, imidazolidinyl, imidazolinyl, imidazolyl, 1H-indazolyl, indolenyl, indolinyl, indolizinyl, indolyl, 3H-indolyl, isatinoyl, isobenzofuranyl, isochromanyl, isoindazolyl, isoindolinyl, isoindolyl, isoquinolinyl, isothiazolyl, isoxazolyl, methylenedioxyphenyl, morpholinyl, naphthyridinyl, octahydroisoquinolinyl, oxadiazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, 1,2,4-oxadiazol5(4H)-one, oxazolidinyl, oxazolyl, oxindolyl, pyrimidinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phenothiazinyl, phenoxathinyl, phenoxazinyl, phthalazinyl, piperazinyl, piperidinyl, piperidonyl, 4-piperidonyl, piperonyl, pteridinyl, purinyl, pyranyl, pyrazinyl, pyrazolidinyl, pyrazolinyl, pyrazolyl, pyridazinyl, pyridooxazole, pyridoimidazole, pyridothiazole, pyridinyl, pyridyl, pyrimidinyl, pyrrolidinyl, pyrrolinyl, 2H-pyrrolyl, pyrrolyl, quinazolinyl, quinolinyl, 4H-quinolizinyl, quinoxalinyl, quinuclidinyl, tetrahydrofuranyl, tetrahydroisoquinolinyl, tetrahydroquinolinyl, tetrazolyl, 6H-1,2,5-thiadiazinyl, 1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, thianthrenyl, thiazolyl, thienyl, thienothiazolyl, thienooxazolyl, thienoimidazolyl, thiophenyl, triazinyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,5-triazolyl, 1,3,4-triazolyl and xanthenyl.

The term “substituted”, as used herein, means that any one or more hydrogen atoms on the designated atom is replaced with a selection from the indicated groups, provided that the designated atom's normal valency is not exceeded, and that the substitution results in a stable compound. When a substituent is keto (i.e., ═O), then 2 hydrogen atoms on the atom are replaced. Keto substituents are not present on aromatic moieties. Ring double bonds, as used herein, are double bonds that are formed between two adjacent ring atoms (e.g., C═C, C═N or N═N). “Stable compound” and “stable structure” are meant to indicate a compound that is sufficiently robust to survive isolation to a useful degree of purity from a reaction mixture, and formulation into an efficacious therapeutic agent.

When a bond to a substituent is shown to cross a bond connecting two atoms in a ring, then such substituent may be bonded to any atom in the ring. When a substituent is listed without indicating the atom via which such substituent is bonded to the rest of the compound of a given formula, then such substituent may be bonded via any atom in such formula. Combinations of substituents and/or variables are permissible, but only if such combinations result in stable compounds.

When any variable (e.g., R₁) occurs more than one time in any constituent or formula for a compound, its definition at each occurrence is independent of its definition at every other occurrence. Thus, for example, if a group is shown to be substituted with 0-2 R₁ moieties, then the group may optionally be substituted with up to two R₁ moieties and R₁ at each occurrence is selected independently from the definition of R₁. Also, combinations of substituents and/or variables are permissible, but only if such combinations result in stable compounds.

The term “hydroxy” or “hydroxyl” includes groups with an —OH or —O⁻.

As used herein, “halo” or “halogen” refers to fluoro, chloro, bromo and iodo. The term “perhalogenated” generally refers to a moiety wherein all hydrogen atoms are replaced by halogen atoms.

The term “carbonyl” or “carboxy” includes compounds and moieties which contain a carbon connected with a double bond to an oxygen atom. Examples of moieties containing a carbonyl include, but are not limited to, aldehydes, ketones, carboxylic acids, amides, esters, anhydrides, etc.

“Acyl” includes moieties that contain the acyl radical (—C(O)—) or a carbonyl group. “Substituted acyl” includes acyl groups where one or more of the hydrogen atoms are replaced by, for example, alkyl groups, alkynyl groups, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, amino (including alkylamino, dialkylamino, arylamino, diarylamino and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), amidino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moiety.

“Aroyl” includes moieties with an aryl or heteroaromatic moiety bound to a carbonyl group. Examples of aroyl groups include phenylcarboxy, naphthyl carboxy, etc.

“Alkoxyalkyl”, “alkylaminoalkyl” and “thioalkoxyalkyl” include alkyl groups, as described above, wherein oxygen, nitrogen or sulfur atoms replace one or more hydrocarbon backbone carbon atoms.

The term “alkoxy” or “alkoxyl” includes substituted and unsubstituted alkyl, alkenyl and alkynyl groups covalently linked to an oxygen atom. Examples of alkoxy groups or alkoxyl radicals include, but are not limited to, methoxy, ethoxy, isopropyloxy, propoxy, butoxy and pentoxy groups. Examples of substituted alkoxy groups include halogenated alkoxy groups. The alkoxy groups can be substituted with groups such as alkenyl, alkynyl, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, amino (including alkylamino, dialkylamino, arylamino, diarylamino, and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), amidino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moieties. Examples of halogen substituted alkoxy groups include, but are not limited to, fluoromethoxy, difluoromethoxy, trifluoromethoxy, chloromethoxy, dichloromethoxy and trichloromethoxy.

The term “ether” or “alkoxy” includes compounds or moieties which contain an oxygen bonded to two carbon atoms or heteroatoms. For example, the term includes “alkoxyalkyl”, which refers to an alkyl, alkenyl, or alkynyl group covalently bonded to an oxygen atom which is covalently bonded to an alkyl group.

The term “ester” includes compounds or moieties which contain a carbon or a heteroatom bound to an oxygen atom which is bonded to the carbon of a carbonyl group. The term “ester” includes alkoxycarboxy groups such as methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, butoxycarbonyl, pentoxycarbonyl, etc.

The term “thioalkyl” includes compounds or moieties which contain an alkyl group connected with a sulfur atom. The thioalkyl groups can be substituted with groups such as alkyl, alkenyl, alkynyl, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryl oxycarbonyloxy, carboxylate, carboxyacid, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, amino (including alkylamino, dialkylamino, arylamino, diarylamino and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido), amidino, imino, sulfhydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, heterocyclyl, alkylaryl, or an aromatic or heteroaromatic moieties.

The term “thiocarbonyl” or “thiocarboxy” includes compounds and moieties which contain a carbon connected with a double bond to a sulfur atom.

The term “thioether” includes moieties which contain a sulfur atom bonded to two carbon atoms or heteroatoms. Examples of thioethers include, but are not limited to alkthioalkyls, alkthioalkenyls and alkthioalkynyls. The term “alkthioalkyls” include moieties with an alkyl, alkenyl or alkynyl group bonded to a sulfur atom which is bonded to an alkyl group. Similarly, the term “alkthioalkenyls” refers to moieties wherein an alkyl, alkenyl or alkynyl group is bonded to a sulfur atom which is covalently bonded to an alkenyl group; and alkthioalkynyls” refers to moieties wherein an alkyl, alkenyl or alkynyl group is bonded to a sulfur atom which is covalently bonded to an alkynyl group.

As used herein, “amine” or “amino” includes moieties where a nitrogen atom is covalently bonded to at least one carbon or heteroatom. “Alkylamino” includes groups of compounds wherein nitrogen is bound to at least one alkyl group. Examples of alkylamino groups include benzylamino, methylamino, ethylamino, phenethylamino, etc.

“Dialkylamino” includes groups wherein the nitrogen atom is bound to at least two additional alkyl groups. Examples of dialkylamino groups include, but are not limited to, dimethylamino and diethylamino. “Arylamino” and “diarylamino” include groups wherein the nitrogen is bound to at least one or two aryl groups, respectively. “Alkylarylamino”, “alkylaminoaryl” or “arylaminoalkyl” refers to an amino group which is bound to at least one alkyl group and at least one aryl group. “Alkaminoalkyl” refers to an alkyl, alkenyl, or alkynyl group bound to a nitrogen atom which is also bound to an alkyl group. “Acylamino” includes groups wherein nitrogen is bound to an acyl group. Examples of acylamino include, but are not limited to, alkylcarbonylamino, arylcarbonylamino, carbamoyl and ureido groups.

The term “amide” or “aminocarboxy” includes compounds or moieties that contain a nitrogen atom that is bound to the carbon of a carbonyl or a thiocarbonyl group. The term includes “alkaminocarboxy” groups that include alkyl, alkenyl or alkynyl groups bound to an amino group which is bound to the carbon of a carbonyl or thiocarbonyl group. It also includes “arylaminocarboxy” groups that include aryl or heteroaryl moieties bound to an amino group that is bound to the carbon of a carbonyl or thiocarbonyl group. The terms “alkylaminocarboxy”, “alkenylaminocarboxy”, “alkynylaminocarboxy” and “arylaminocarboxy” include moieties wherein alkyl, alkenyl, alkynyl and aryl moieties, respectively, are bound to a nitrogen atom which is in turn bound to the carbon of a carbonyl group. Amides can be substituted with substituents such as straight chain alkyl, branched alkyl, cycloalkyl, aryl, heteroaryl or heterocycle. Substituents on amide groups may be further substituted.

Compounds of the present invention that contain nitrogens can be converted to N-oxides by treatment with an oxidizing agent (e.g., 3-chloroperoxybenzoic acid (m-CPBA) and/or hydrogen peroxides) to afford other compounds of the present invention. Thus, all shown and claimed nitrogen-containing compounds are considered, when allowed by valency and structure, to include both the compound as shown and its N-oxide derivative (which can be designated as N→O or N⁺—O⁻). Furthermore, in other instances, the nitrogens in the compounds of the present invention can be converted to N-hydroxy or N-alkoxy compounds. For example, N-hydroxy compounds can be prepared by oxidation of the parent amine by an oxidizing agent such as m-CPBA. All shown and claimed nitrogen-containing compounds are also considered, when allowed by valency and structure, to cover both the compound as shown and its N-hydroxy (i.e., N—OH) and N-alkoxy (i.e., N—OR, wherein R is substituted or unsubstituted C₁-C₆ alkyl, C₁-C₆ alkenyl, C₁-C₆ alkynyl, 3-14-membered carbocycle or 3-14-membered heterocycle) derivatives.

In the present specification, the structural formula of the compound represents a certain isomer for convenience in some cases, but the present invention includes all isomers, such as geometrical isomers, optical isomers based on an asymmetrical carbon, stereoisomers, tautomers, and the like. In addition, a crystal polymorphism may be present for the compounds represented by the formula. It is noted that any crystal form, crystal form mixture, or anhydride or hydrate thereof is included in the scope of the present invention. Furthermore, so-called metabolite which is produced by degradation of the present compound in vivo is included in the scope of the present invention.

“Isomerism” means compounds that have identical molecular formulae but differ in the sequence of bonding of their atoms or in the arrangement of their atoms in space. Isomers that differ in the arrangement of their atoms in space are termed “stereoisomers”. Stereoisomers that are not mirror images of one another are termed “diastereoisomers”, and stereoisomers that are non-superimposable mirror images of each other are termed “enantiomers” or sometimes optical isomers. A mixture containing equal amounts of individual enantiomeric forms of opposite chirality is termed a “racemic mixture”.

A carbon atom bonded to four nonidentical substituents is termed a “chiral center”.

“Chiral isomer” means a compound with at least one chiral center. Compounds with more than one chiral center may exist either as an individual diastereomer or as a mixture of diastereomers, termed “diastereomeric mixture”. When one chiral center is present, a stereoisomer may be characterized by the absolute configuration (R or S) of that chiral center. Absolute configuration refers to the arrangement in space of the substituents attached to the chiral center. The substituents attached to the chiral center under consideration are ranked in accordance with the Sequence Rule of Cahn, Ingold and Prelog. (Cahn et al., Angew. Chem. Inter. Edit. 1966, 5, 385; errata 511; Cahn et al., Angew. Chem. 1966, 78, 413; Cahn and Ingold, J. Chem. Soc. 1951 (London), 612; Cahn et al., Experientia 1956, 12, 81; Cahn, J. Chem. Educ. 1964, 41, 116).

“Geometric isomer” means the diastereomers that owe their existence to hindered rotation about double bonds. These configurations are differentiated in their names by the prefixes cis and trans, or Z and E, which indicate that the groups are on the same or opposite side of the double bond in the molecule according to the Cahn-Ingold-Prelog rules.

Furthermore, the structures and other compounds discussed in this invention include all atropic isomers thereof. “Atropic isomers” are a type of stereoisomer in which the atoms of two isomers are arranged differently in space. Atropic isomers owe their existence to a restricted rotation caused by hindrance of rotation of large groups about a central bond. Such atropic isomers typically exist as a mixture, however as a result of recent advances in chromatography techniques; it has been possible to separate mixtures of two atropic isomers in select cases.

“Tautomer” is one of two or more structural isomers that exist in equilibrium and is readily converted from one isomeric form to another. This conversion results in the formal migration of a hydrogen atom accompanied by a switch of adjacent conjugated double bonds. Tautomers exist as a mixture of a tautomeric set in solution. In solid form, usually one tautomer predominates. In solutions where tautomerization is possible, a chemical equilibrium of the tautomers will be reached. The exact ratio of the tautomers depends on several factors, including temperature, solvent and pH. The concept of tautomers that are interconvertable by tautomerizations is called tautomerism.

Of the various types of tautomerism that are possible, two are commonly observed. In keto-enol tautomerism a simultaneous shift of electrons and a hydrogen atom occurs. Ring-chain tautomerism arises as a result of the aldehyde group (—CHO) in a sugar chain molecule reacting with one of the hydroxy groups (—OH) in the same molecule to give it a cyclic (ring-shaped) form as exhibited by glucose.

Common tautomeric pairs are: ketone-enol, amide-nitrile, lactam-lactim, amide-imidic acid tautomerism in heterocyclic rings (e.g., in nucleobases such as guanine, thymine and cytosine), amine-enamine and enamine-enamine.

It is to be understood that the compounds of the present invention may be depicted as different tautomers. It should also be understood that when compounds have tautomeric forms, all tautomeric forms are intended to be included in the scope of the present invention, and the naming of the compounds does not exclude any tautomer form.

The term “crystal polymorphs”, “polymorphs” or “crystal forms” means crystal structures in which a compound (or a salt or solvate thereof) can crystallize in different crystal packing arrangements, all of which have the same elemental composition. Different crystal forms usually have different X-ray diffraction patterns, infrared spectral, melting points, density hardness, crystal shape, optical and electrical properties, stability and solubility. Recrystallization solvent, rate of crystallization, storage temperature, and other factors may cause one crystal form to dominate. Crystal polymorphs of the compounds can be prepared by crystallization under different conditions.

Additionally, the compounds of the present invention, for example, the salts of the compounds, can exist in either hydrated or unhydrated (the anhydrous) form or as solvates with other solvent molecules. Nonlimiting examples of hydrates include monohydrates, dihydrates, etc. Nonlimiting examples of solvates include ethanol solvates, acetone solvates, etc.

“Solvate” means solvent addition forms that contain either stoichiometric or non stoichiometric amounts of solvent. Some compounds have a tendency to trap a fixed molar ratio of solvent molecules in the crystalline solid state, thus forming a solvate. If the solvent is water the solvate formed is a hydrate; and if the solvent is alcohol, the solvate formed is an alcoholate. Hydrates are formed by the combination of one or more molecules of water with one molecule of the substance in which the water retains its molecular state as H₂O.

As used herein, the term “analog” refers to a chemical compound that is structurally similar to another but differs slightly in composition (as in the replacement of one atom by an atom of a different element or in the presence of a particular functional group, or the replacement of one functional group by another functional group). Thus, an analog is a compound that is similar or comparable in function and appearance, but not in structure or origin to the reference compound.

As defined herein, the term “derivative” refers to compounds that have a common core structure, and are substituted with various groups as described herein. For example, all of the compounds represented by formula I are imidazopyridinyl-aminopyridine derivatives, and have formula I as a common core.

The term “bioisostere” refers to a compound resulting from the exchange of an atom or of a group of atoms with another, broadly similar, atom or group of atoms. The objective of a bioisosteric replacement is to create a new compound with similar biological properties to the parent compound. The bioisosteric replacement may be physicochemically or topologically based. Examples of carboxylic acid bioisosteres include, but are not limited to, acyl sulfonimides, tetrazoles, sulfonates and phosphonates. See, e.g., Patani and LaVoie, Chem. Rev. 96, 3147-3176, 1996.

The present invention is intended to include all isotopes of atoms occurring in the present compounds. Isotopes include those atoms having the same atomic number but different mass numbers. By way of general example and without limitation, isotopes of hydrogen include tritium and deuterium, and isotopes of carbon include C-13 and C-14.

2. Synthesis of Substituted Imidazopyridinyl-Aminopyridine Compounds

The present invention provides methods for the synthesis of the compounds of each of the formulae described herein. The present invention also provides detailed methods for the synthesis of various disclosed compounds of the present invention according to the following schemes as shown in the examples.

Throughout the description, where compositions are described as having, including, or comprising specific components, it is contemplated that compositions also consist essentially of, or consist of, the recited components. Similarly, where methods or processes are described as having, including, or comprising specific process steps, the processes also consist essentially of, or consist of, the recited processing steps. Further, it should be understood that the order of steps or order for performing certain actions is immaterial so long as the invention remains operable. Moreover, two or more steps or actions can be conducted simultaneously.

The synthetic processes of the invention can tolerate a wide variety of functional groups, therefore various substituted starting materials can be used. The processes generally provide the desired final compound at or near the end of the overall process, although it may be desirable in certain instances to further convert the compound to a pharmaceutically acceptable salt, ester or prodrug thereof.

Compounds of the present invention can be prepared in a variety of ways using commercially available starting materials, compounds known in the literature, or from readily prepared intermediates, by employing standard synthetic methods and procedures either known to those skilled in the art, or which will be apparent to the skilled artisan in light of the teachings herein. Standard synthetic methods and procedures for the preparation of organic molecules and functional group transformations and manipulations can be obtained from the relevant scientific literature or from standard textbooks in the field. Although not limited to any one or several sources, classic texts such as Smith, M. B., March, J., March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 5^(th) edition, John Wiley & Sons: New York, 2001; and Greene, T. W., Wuts, P. G. M., Protective Groups in Organic Synthesis, 3^(rd) edition, John Wiley & Sons: New York, 1999, incorporated by reference herein, are useful and recognized reference textbooks of organic synthesis known to those in the art. The following descriptions of synthetic methods are designed to illustrate, but not to limit, general procedures for the preparation of compounds of the present invention.

Compounds of the present invention can be conveniently prepared by a variety of methods familiar to those skilled in the art. The compounds each of the formulae described herein may be prepared according to the following procedures from commercially available starting materials or starting materials which can be prepared using literature procedures. These procedures show the preparation of representative compounds of this invention.

All the abbreviations used in this application are found in “Protective Groups in Organic Synthesis” by John Wiley & Sons, Inc, or the MERCK INDEX by MERCK & Co., Inc, or other chemistry books or chemicals catalogs by chemicals vendor such as Aldrich, or according to usage know in the art.

General Procedure A

One general procedure for R₂-amino-substituted imidazopyridine formation is described below in Scheme 1.

Step 1. Synthesis of 3-nitro-N-phenylpyridin-2-amine (structure 3 as shown in Scheme 1). 2-chloro-3-nitropyridine (structure 1 as shown in Scheme 1) was dissolved in THF (10 mL/mmol) in a round bottom flask. Aniline (1.0 eq.) (structure 2 as shown in Scheme 1) and diisopropylethylamine (1.05 eq.) were added. The reaction mixture was heated to the appropriate temperature for 4 to 36 hours. After cooling to room temperature the solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate (20 mL/mmol) and washed with water and brine (20 mL/mmol respectively). The organic phase was separated and dried over Na₂SO₄. After filtration the solvent was removed under reduced pressure. The crude product (red to brown solid) was solidified with hexane/ethyl acetate and collected by filtration. The product was carried on to the next step without further purification.

Step 1-1. Synthesis of N¹/O¹/S¹-alkyl/aryl-3-nitro-N²-phenylpyridine-2,6-diamine (structure 3b as shown in Scheme 1). Intermediate (structure 3a as shown in Scheme 1) (1 eq.) was dissolved in dioxane (5 mL/mmol) in a round bottom flask. Alky/aryl amine/sulfur/alcohol (2 eq.) was added and diisopropylamine (2.5 eq.). The reaction mixture was heated to 80° C. in an oil bath for 24 h. After cooling to room temperature the solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate (10 mL/mmol) and washed with water and brine (5 mL/mmol respectively). The organic phase was separated and dried over Na₂SO₄. After filtration the solvent was removed under reduced pressure. The crude product (structure 3b as shown in Scheme 1) was carried on to the next step without further purification.

Step 2. Synthesis of 3-(3-phenyl-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine (structure 5 as shown in Scheme 1). 3-Nitro-N-phenylpyridin-2-amine (structure 3 as shown in Scheme 1) was dissolved in dimethylsulfoxide (8 mL/mmol) and methanol (1.5 mL/mmol) in a round bottom flask. 2-aminonicotinaldehyde 4 (1.1 eq.) and Na₂S₂O₄ (85%, 2.5 eq.) were added. The reaction mixture was heated at 100° C. for 15 to 36 hours. After cooling to room temperature the reaction mixture was diluted with dichloromethane (20 mL/mmol) and washed with water and brine. The organic phase was separated and dried over Na₂SO₄. After filtration the solvent was removed under reduced pressure. The crude product was purified by silica gel chromatography (dichloromethane/methanol; 0-20% methanol over 60 min) to give a yellow to brown solid.

General Procedure B

One general procedure for BOC group deprotection is described below in Scheme 2.

Carbamate (structure 5 as shown in Scheme 2) (1 eq.) was dissolved in methanol. HCl (20 eq., 4 M in dioxane) was added and stirred at room temperature for 2 to 4 hours. Concentration under reduced pressure and solidified with ethyl acetate collection by filtration gave the deprotected amine (structure 6 as shown in Scheme 2) as hydrochloric acid salt as a powder, which was used for the next step without further purification.

General Procedure C

One general procedure for amide formation is described below in Scheme 3.

To a mixture of amine (structure 7 as shown in Scheme 3) (1 eq.) and aryl/alkyl amine (1.1 eq.) in dimethylformamide (5 mL/mmol) was added 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (1.2 eq.) and diisopropylethylamine (3 eq.). The reaction mixture was stirred for 15 hours at room temperature then quenched with water (2 mL/mmol). The mixture was diluted with ethyl acetate and the organic phase was separated, washed with brine (5 mL/mmol) and dried over Na₂SO₄. After filtration the solvent was removed under reduced pressure. The crude product (structure 8 as shown in Scheme 3) was purified by silica gel chromatography (hexanes/ethyl acetate/methanol; 100/0/0 to 0/90/10).

General Procedure D

One general procedure for sulfonamide formation is described below in Scheme 4.

To a mixture of amine (structure 9 as shown in Scheme 4) (1 eq.) and sulfonyl chloride (1.1 eq.) in dichloromethane (5 mL/mmol) was added diisopropylethylamine (3 eq.). The reaction mixture was stirred for 15 hours at room temperature then quenched with water (2 mL/mmol). The organic phase was separated, washed with brine (5 mL/mmol) and dried over Na₂SO₄. After filtration the solvent was removed under reduced pressure. The crude product (structure 10 as shown in Scheme 4) was purified by silica gel chromatography (0-100% ethyl acetate in hexanes).

General Procedure E

One general procedure for saponification is described below in Scheme 5.

Ethyl 2-(4-(2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridine-3-yl)phenyl) acetate (structure 11 as shown in Scheme 5) (obtained by General Procedure A) was dissolved in tetrahydrofuran (2 mL/mmol) and methanol (0.7 mL/mmol) in a round bottom flask. NaOH H₂O (5 eq.) in H₂O (0.5 mL/mmol) was added. The reaction mixture was carried out at room temperature for 18 hours. The organic solvent was removed under reduced pressure. The water phase was neutralized with HCl (5 eq) in H₂O (0.5 mL/mmol) and the solid was collected with filtration to yield product (structure 12 as shown in Scheme 5). The product 12 was carried on to the next step without further purification.

General Procedure F

A general procedure for the Suzuki coupling reaction is described below in Scheme 6 and Scheme 7.

Organo halide (structure 3a as shown in Scheme 6) (1 eq.), boronic acid or pinacol ester (2 eq.), and Pd(PPh₃)₄ (tetrakis(triphenylphosphine)palladium(0)) (0.05 eq) were suspended in a mixture of ethanol and toluene, 10 mL/mmol respectively. A solution of saturated NaHCO₃ was added (1 mL/mmol). The reaction mixture was degassed with nitrogen for 30 min. Subsequently it was heated to 100° C. overnight under nitrogen. After cooling down to room temperature the solvent was removed in vacuo. The crude residue was purified by silica gel chromatography (hexane/3-20% methanol in ethyl acetate) to give product (structure 13 as shown in Scheme 6).

General Procedure G

Organo halide (5a as shown in Scheme 7) (1 eq.), Na₂CO₃ (1.2 eq.), AMPHOS (bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II)) (0.1 eq.) and aryl boronic acid (2 eq.) were dissolved in DMF/water. The reaction mixture was heated in the microwave for 60 min to 160° C. The solvent was removed under reduced pressure and the crude product was purified by silica gel chromatography (hexane/3-20% methanol in ethyl acetate) to yield the product (14 as shown in Scheme 7).

General Procedure H

A general procedure for the boronic acid pinacol ester formation is described below in Scheme 8.

Step 1: 1,3-dibromobenzene (1 eq.), Pd₂ dba₃ (tris(dibenzylideneacetone)dipalladium(0)) (5 mol %), rac-BINAP (7.5 mol %), cesium carbonate (3 eq.) and amine (1 eq.) were dissolved in toluene (2.5 mL/mmol). The reaction mixture was stirred for 5 hr at 80° C. The mixture was filtered through celite pad and the solvent was removed under vacuum. The residue was purified by silica gel column chromatography (hexane/ethyl acetate, 10:0 to 9:1) to yield product as a pale brown oil (16 as shown in Scheme 8). Step 2: Amino-3-bromobenzene (1 eq.), potassium acetate (3 eq.), PdCl₂dppf ([1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with dichloromethane) (4 mol %), and pinacol diboron (1.5 eq.) were dissolved in dimethyl formamide (DMF) (5 mL/mmol). The mixture was heated at 80° C. for 6 h and diluted with ethyl acetate and mixed with water. The organic layer was separated, dried over anhydrous Na₂SO₄, and evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate, 10:0 to 0:10) to yield product as a pale brown solid (structure 17 as shown in Scheme 8). Step 1.1: The compound 19 was synthesized from 18 by a similar procedure to that described above.

3. Methods of Treatment

The present invention provides methods for the treatment of a cell proliferative disorder in a subject in need thereof by administering to a subject in need of such treatment, a therapeutically effective amount of a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof. The cell proliferative disorder can be cancer or a precancerous condition. The present invention further provides the use of a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, for the preparation of a medicament useful for the treatment of a cell proliferative disorder.

The present invention also provides methods of protecting against a cell proliferative disorder in a subject in need thereof by administering a therapeutically effective amount of compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, to a subject in need of such treatment. The cell proliferative disorder can be cancer or a precancerous condition. The present invention also provides the use of compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, for the preparation of a medicament useful for the prevention of a cell proliferative disorder.

As used herein, a “subject in need thereof” is a subject having a cell proliferative disorder, or a subject having an increased risk of developing a cell proliferative disorder relative to the population at large. A subject in need thereof can have a precancerous condition. Preferably, a subject in need thereof has cancer. A “subject” includes a mammal. The mammal can be e.g., any mammal, e.g., a human, primate, bird, mouse, rat, fowl, dog, cat, cow, horse, goat, camel, sheep or a pig. Preferably, the mammal is a human.

As used herein, the term “cell proliferative disorder” refers to conditions in which unregulated or abnormal growth, or both, of cells can lead to the development of an unwanted condition or disease, which may or may not be cancerous. Exemplary cell proliferative disorders of the invention encompass a variety of conditions wherein cell division is deregulated. Exemplary cell proliferative disorder include, but are not limited to, neoplasms, benign tumors, malignant tumors, pre-cancerous conditions, in situ tumors, encapsulated tumors, metastatic tumors, liquid tumors, solid tumors, immunological tumors, hematological tumors, cancers, carcinomas, leukemias, lymphomas, sarcomas, and rapidly dividing cells. The term “rapidly dividing cell” as used herein is defined as any cell that divides at a rate that exceeds or is greater than what is expected or observed among neighboring or juxtaposed cells within the same tissue. A cell proliferative disorder includes a precancer or a precancerous condition. A cell proliferative disorder includes cancer. Preferably, the methods provided herein are used to treat or alleviate a symptom of cancer. The term “cancer” includes solid tumors, as well as, hematologic tumors and/or malignancies. A “precancer cell” or “precancerous cell” is a cell manifesting a cell proliferative disorder that is a precancer or a precancerous condition. A “cancer cell” or “cancerous cell” is a cell manifesting a cell proliferative disorder that is a cancer. Any reproducible means of measurement may be used to identify cancer cells or precancerous cells. Cancer cells or precancerous cells can be identified by histological typing or grading of a tissue sample (e.g., a biopsy sample). Cancer cells or precancerous cells can be identified through the use of appropriate molecular markers.

Exemplary non-cancerous conditions or disorders include, but are not limited to, rheumatoid arthritis; inflammation; autoimmune disease; lymphoproliferative conditions; acromegaly; rheumatoid spondylitis; osteoarthritis; gout, other arthritic conditions; sepsis; septic shock; endotoxic shock; gram-negative sepsis; toxic shock syndrome; asthma; adult respiratory distress syndrome; chronic obstructive pulmonary disease; chronic pulmonary inflammation; inflammatory bowel disease; Crohn's disease; psoriasis; eczema; ulcerative colitis; pancreatic fibrosis; hepatic fibrosis; acute and chronic renal disease; irritable bowel syndrome; pyresis; restenosis; cerebral malaria; stroke and ischemic injury; neural trauma; Alzheimer's disease; Huntington's disease; Parkinson's disease; acute and chronic pain; allergic rhinitis; allergic conjunctivitis; chronic heart failure; acute coronary syndrome; cachexia; malaria; leprosy; leishmaniasis; Lyme disease; Reiter's syndrome; acute synovitis; muscle degeneration, bursitis; tendonitis; tenosynovitis; herniated, ruptures, or prolapsed intervertebral disk syndrome; osteopetrosis; thrombosis; restenosis; silicosis; pulmonary sarcosis; bone resorption diseases, such as osteoporosis; graft-versus-host reaction; Multiple Sclerosis; lupus; fibromyalgia; AIDS and other viral diseases such as Herpes Zoster, Herpes Simplex I or II, influenza virus and cytomegalovirus; and diabetes mellitus.

Exemplary cancers include, but are not limited to, adrenocortical carcinoma, AIDS-related cancers, AIDS-related lymphoma, anal cancer, anorectal cancer, cancer of the anal canal, appendix cancer, childhood cerebellar astrocytoma, childhood cerebral astrocytoma, basal cell carcinoma, skin cancer (non-melanoma), biliary cancer, extrahepatic bile duct cancer, intrahepatic bile duct cancer, bladder cancer, urinary bladder cancer, bone and joint cancer, osteosarcoma and malignant fibrous histiocytoma, brain cancer, brain tumor, brain stem glioma, cerebellar astrocytoma, cerebral astrocytoma/malignant glioma, ependymoma, medulloblastoma, supratentorial primitive neuroectodeimal tumors, visual pathway and hypothalamic glioma, breast cancer, bronchial adenomas/carcinoids, carcinoid tumor, gastrointestinal, nervous system cancer, nervous system lymphoma, central nervous system cancer, central nervous system lymphoma, cervical cancer, childhood cancers, chronic lymphocytic leukemia, chronic myelogenous leukemia, chronic myeloproliferative disorders, colon cancer, colorectal cancer, cutaneous T-cell lymphoma, lymphoid neoplasm, mycosis fungoides, Seziary Syndrome, endometrial cancer, esophageal cancer, extracranial germ cell tumor, extragonadal germ cell tumor, extrahepatic bile duct cancer, eye cancer, intraocular melanoma, retinoblastoma, gallbladder cancer, gastric (stomach) cancer, gastrointestinal carcinoid tumor, gastrointestinal stromal tumor (GIST), germ cell tumor, ovarian germ cell tumor, gestational trophoblastic tumor glioma, head and neck cancer, hepatocellular (liver) cancer, Hodgkin lymphoma, hypopharyngeal cancer, intraocular melanoma, ocular cancer, islet cell tumors (endocrine pancreas), Kaposi Sarcoma, kidney cancer, renal cancer, kidney cancer, laryngeal cancer, acute lymphoblastic leukemia, acute myeloid leukemia, chronic lymphocytic leukemia, chronic myelogenous leukemia, hairy cell leukemia, lip and oral cavity cancer, liver cancer, lung cancer, non-small cell lung cancer, small cell lung cancer, AIDS-related lymphoma, non-Hodgkin lymphoma, primary central nervous system lymphoma, Waldenstram macroglobulinemia, medulloblastoma, melanoma, intraocular (eye) melanoma, merkel cell carcinoma, mesothelioma malignant, mesothelioma, metastatic squamous neck cancer, mouth cancer, cancer of the tongue, multiple endocrine neoplasia syndrome, mycosis fungoides, myelodysplastic syndromes, myelodysplastic/myeloproliferative diseases, chronic myelogenous leukemia, acute myeloid leukemia, multiple myeloma, chronic myeloproliferative disorders, nasopharyngeal cancer, neuroblastoma, oral cancer, oral cavity cancer, oropharyngeal cancer, ovarian cancer, ovarian epithelial cancer, ovarian low malignant potential tumor, pancreatic cancer, islet cell pancreatic cancer, paranasal sinus and nasal cavity cancer, parathyroid cancer, penile cancer, pharyngeal cancer, pheochromocytoma, pineoblastoma and supratentorial primitive neuroectodermal tumors, pituitary tumor, plasma cell neoplasm/multiple myeloma, pleuropulmonary blastoma, prostate cancer, rectal cancer, renal pelvis and ureter, transitional cell cancer, retinoblastoma, rhabdomyosarcoma, salivary gland cancer, ewing family of sarcoma tumors, Kaposi Sarcoma, soft tissue sarcoma, uterine cancer, uterine sarcoma, skin cancer (non-melanoma), skin cancer (melanoma), merkel cell skin carcinoma, small intestine cancer, soft tissue sarcoma, squamous cell carcinoma, stomach (gastric) cancer, supratentorial primitive neuroectodermal tumors, testicular cancer, throat cancer, thymoma, thymoma and thymic carcinoma, thyroid cancer, transitional cell cancer of the renal pelvis and ureter and other urinary organs, gestational trophoblastic tumor, urethral cancer, endometrial uterine cancer, uterine sarcoma, uterine corpus cancer, vaginal cancer, vulvar cancer, and Wilm's Tumor.

A “cell proliferative disorder of the hematologic system” is a cell proliferative disorder involving cells of the hematologic system. A cell proliferative disorder of the hematologic system can include lymphoma, leukemia, myeloid neoplasms, mast cell neoplasms, myelodysplasia, benign monoclonal gammopathy, lymphomatoid granulomatosis, lymphomatoid papulosis, polycythemia vera, chronic myelocytic leukemia, agnogenic myeloid metaplasia, and essential thrombocythemia. A cell proliferative disorder of the hematologic system can include hyperplasia, dysplasia, and metaplasia of cells of the hematologic system. Preferably, compositions of the present invention may be used to treat a cancer selected from the group consisting of a hematologic cancer of the present invention or a hematologic cell proliferative disorder of the present invention. A hematologic cancer of the present invention can include multiple myeloma, lymphoma (including Hodgkin's lymphoma, non-Hodgkin's lymphoma, childhood lymphomas, and lymphomas of lymphocytic and cutaneous origin), leukemia (including childhood leukemia, hairy-cell leukemia, acute lymphocytic leukemia, acute myelocytic leukemia, chronic lymphocytic leukemia, chronic myelocytic leukemia, chronic myelogenous leukemia, and mast cell leukemia), myeloid neoplasms and mast cell neoplasms.

A “cell proliferative disorder of the lung” is a cell proliferative disorder involving cells of the lung. Cell proliferative disorders of the lung can include all forms of cell proliferative disorders affecting lung cells. Cell proliferative disorders of the lung can include lung cancer, a precancer or precancerous condition of the lung, benign growths or lesions of the lung, and malignant growths or lesions of the lung, and metastatic lesions in tissue and organs in the body other than the lung. Preferably, compositions of the present invention may be used to treat lung cancer or cell proliferative disorders of the lung. Lung cancer can include all forms of cancer of the lung. Lung cancer can include malignant lung neoplasms, carcinoma in situ, typical carcinoid tumors, and atypical carcinoid tumors. Lung cancer can include small cell lung cancer (“SCLC”), non-small cell lung cancer (“NSCLC”), squamous cell carcinoma, adenocarcinoma, small cell carcinoma, large cell carcinoma, adenosquamous cell carcinoma, and mesothelioma. Lung cancer can include “scar carcinoma”, bronchioalveolar carcinoma, giant cell carcinoma, spindle cell carcinoma, and large cell neuroendocrine carcinoma. Lung cancer can include lung neoplasms having histologic and ultrastructual heterogeneity (e.g., mixed cell types).

Cell proliferative disorders of the lung can include all forms of cell proliferative disorders affecting lung cells. Cell proliferative disorders of the lung can include lung cancer, precancerous conditions of the lung. Cell proliferative disorders of the lung can include hyperplasia, metaplasia, and dysplasia of the lung. Cell proliferative disorders of the lung can include asbestos-induced hyperplasia, squamous metaplasia, and benign reactive mesothelial metaplasia. Cell proliferative disorders of the lung can include replacement of columnar epithelium with stratified squamous epithelium, and mucosal dysplasia. Individuals exposed to inhaled injurious environmental agents such as cigarette smoke and asbestos may be at increased risk for developing cell proliferative disorders of the lung. Prior lung diseases that may predispose individuals to development of cell proliferative disorders of the lung can include chronic interstitial lung disease, necrotizing pulmonary disease, scleroderma, rheumatoid disease, sarcoidosis, interstitial pneumonitis, tuberculosis, repeated pneumonias, idiopathic pulmonary fibrosis, granulomata, asbestosis, fibrosing alveolitis, and Hodgkin's disease.

A “cell proliferative disorder of the colon” is a cell proliferative disorder involving cells of the colon. Preferably, the cell proliferative disorder of the colon is colon cancer. Preferably, compositions of the present invention may be used to treat colon cancer or cell proliferative disorders of the colon. Colon cancer can include all forms of cancer of the colon. Colon cancer can include sporadic and hereditary colon cancers. Colon cancer can include malignant colon neoplasms, carcinoma in situ, typical carcinoid tumors, and atypical carcinoid tumors. Colon cancer can include adenocarcinoma, squamous cell carcinoma, and adenosquamous cell carcinoma. Colon cancer can be associated with a hereditary syndrome selected from the group consisting of hereditary nonpolyposis colorectal cancer, familial adenomatous polyposis, Gardner's syndrome, Peutz-Jeghers syndrome, Turcot's syndrome and juvenile polyposis. Colon cancer can be caused by a hereditary syndrome selected from the group consisting of hereditary nonpolyposis colorectal cancer, familial adenomatous polyposis, Gardner's syndrome, Peutz-Jeghers syndrome, Turcot's syndrome and juvenile polyposis.

Cell proliferative disorders of the colon can include all forms of cell proliferative disorders affecting colon cells. Cell proliferative disorders of the colon can include colon cancer, precancerous conditions of the colon, adenomatous polyps of the colon and metachronous lesions of the colon. A cell proliferative disorder of the colon can include adenoma. Cell proliferative disorders of the colon can be characterized by hyperplasia, metaplasia, and dysplasia of the colon. Prior colon diseases that may predispose individuals to development of cell proliferative disorders of the colon can include prior colon cancer. Current disease that may predispose individuals to development of cell proliferative disorders of the colon can include Crohn's disease and ulcerative colitis. A cell proliferative disorder of the colon can be associated with a mutation in a gene selected from the group consisting of p53, ras, FAP and DCC. An individual can have an elevated risk of developing a cell proliferative disorder of the colon due to the presence of a mutation in a gene selected from the group consisting of p53, ras, FAP and DCC.

A “cell proliferative disorder of the pancreas” is a cell proliferative disorder involving cells of the pancreas. Cell proliferative disorders of the pancreas can include all forms of cell proliferative disorders affecting pancreatic cells. Cell proliferative disorders of the pancreas can include pancreas cancer, a precancer or precancerous condition of the pancreas, hyperplasia of the pancreas, and dysaplasia of the pancreas, benign growths or lesions of the pancreas, and malignant growths or lesions of the pancreas, and metastatic lesions in tissue and organs in the body other than the pancreas. Pancreatic cancer includes all forms of cancer of the pancreas. Pancreatic cancer can include ductal adenocarcinoma, adenosquamous carcinoma, pleomorphic giant cell carcinoma, mucinous adenocarcinoma, osteoclast-like giant cell carcinoma, mucinous cystadenocarcinoma, acinar carcinoma, unclassified large cell carcinoma, small cell carcinoma, pancreatoblastoma, papillary neoplasm, mucinous cystadenoma, papillary cystic neoplasm, and serous cystadenoma. Pancreatic cancer can also include pancreatic neoplasms having histologic and ultrastructual heterogeneity (e.g., mixed cell types).

A “cell proliferative disorder of the prostate” is a cell proliferative disorder involving cells of the prostate. Cell proliferative disorders of the prostate can include all forms of cell proliferative disorders affecting prostate cells. Cell proliferative disorders of the prostate can include prostate cancer, a precancer or precancerous condition of the prostate, benign growths or lesions of the prostate, and malignant growths or lesions of the prostate, and metastatic lesions in tissue and organs in the body other than the prostate. Cell proliferative disorders of the prostate can include hyperplasia, metaplasia, and dysplasia of the prostate.

A “cell proliferative disorder of the skin” is a cell proliferative disorder involving cells of the skin. Cell proliferative disorders of the skin can include all forms of cell proliferative disorders affecting skin cells. Cell proliferative disorders of the skin can include a precancer or precancerous condition of the skin, benign growths or lesions of the skin, melanoma, malignant melanoma and other malignant growths or lesions of the skin, and metastatic lesions in tissue and organs in the body other than the skin. Cell proliferative disorders of the skin can include hyperplasia, metaplasia, and dysplasia of the skin.

A “cell proliferative disorder of the ovary” is a cell proliferative disorder involving cells of the ovary. Cell proliferative disorders of the ovary can include all forms of cell proliferative disorders affecting cells of the ovary. Cell proliferative disorders of the ovary can include a precancer or precancerous condition of the ovary, benign growths or lesions of the ovary, ovarian cancer, malignant growths or lesions of the ovary, and metastatic lesions in tissue and organs in the body other than the ovary. Cell proliferative disorders of the skin can include hyperplasia, metaplasia, and dysplasia of cells of the ovary.

A “cell proliferative disorder of the breast” is a cell proliferative disorder involving cells of the breast. Cell proliferative disorders of the breast can include all forms of cell proliferative disorders affecting breast cells. Cell proliferative disorders of the breast can include breast cancer, a precancer or precancerous condition of the breast, benign growths or lesions of the breast, and malignant growths or lesions of the breast, and metastatic lesions in tissue and organs in the body other than the breast. Cell proliferative disorders of the breast can include hyperplasia, metaplasia, and dysplasia of the breast.

A cell proliferative disorder of the breast can be a precancerous condition of the breast. Compositions of the present invention may be used to treat a precancerous condition of the breast. A precancerous condition of the breast can include atypical hyperplasia of the breast, ductal carcinoma in situ (DCIS), intraductal carcinoma, lobular carcinoma in situ (LCIS), lobular neoplasia, and stage 0 or grade 0 growth or lesion of the breast (e.g., stage 0 or grade 0 breast cancer, or carcinoma in situ). A precancerous condition of the breast can be staged according to the TNM classification scheme as accepted by the American Joint Committee on Cancer (AJCC), where the primary tumor (T) has been assigned a stage of T0 or T is; and where the regional lymph nodes (N) have been assigned a stage of N0; and where distant metastasis (M) has been assigned a stage of M0.

The cell proliferative disorder of the breast can be breast cancer. Preferably, compositions of the present invention may be used to treat breast cancer. Breast cancer includes all forms of cancer of the breast. Breast cancer can include primary epithelial breast cancers. Breast cancer can include cancers in which the breast is involved by other tumors such as lymphoma, sarcoma or melanoma. Breast cancer can include carcinoma of the breast, ductal carcinoma of the breast, lobular carcinoma of the breast, undifferentiated carcinoma of the breast, cystosarcoma phyllodes of the breast, angiosarcoma of the breast, and primary lymphoma of the breast. Breast cancer can include Stage I, II, IIIA, IIIB, IIIC and IV breast cancer. Ductal carcinoma of the breast can include invasive carcinoma, invasive carcinoma in situ with predominant intraductal component, inflammatory breast cancer, and a ductal carcinoma of the breast with a histologic type selected from the group consisting of comedo, mucinous (colloid), medullary, medullary with lymphcytic infiltrate, papillary, scirrhous, and tubular. Lobular carcinoma of the breast can include invasive lobular carcinoma with predominant in situ component, invasive lobular carcinoma, and infiltrating lobular carcinoma. Breast cancer can include Paget's disease, Paget's disease with intraductal carcinoma, and Paget's disease with invasive ductal carcinoma. Breast cancer can include breast neoplasms having histologic and ultrastructual heterogeneity (e.g., mixed cell types).

Preferably, compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, may be used to treat breast cancer. A breast cancer that is to be treated can include familial breast cancer. A breast cancer that is to be treated can include sporadic breast cancer. A breast cancer that is to be treated can arise in a male subject. A breast cancer that is to be treated can arise in a female subject. A breast cancer that is to be treated can arise in a premenopausal female subject or a postmenopausal female subject. A breast cancer that is to be treated can arise in a subject equal to or older than 30 years old, or a subject younger than 30 years old. A breast cancer that is to be treated has arisen in a subject equal to or older than 50 years old, or a subject younger than 50 years old. A breast cancer that is to be treated can arise in a subject equal to or older than 70 years old, or a subject younger than 70 years old.

A breast cancer that is to be treated can be typed to identify a familial or spontaneous mutation in BRCA1, BRCA2, or p53. A breast cancer that is to be treated can be typed as having a HER2/neu gene amplification, as overexpressing HER2/neu, or as having a low, intermediate or high level of HER2/neu expression. A breast cancer that is to be treated can be typed for a marker selected from the group consisting of estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor-2, Ki-67, CA15-3, CA 27-29, and c-Met. A breast cancer that is to be treated can be typed as ER-unknown, ER-rich or ER-poor. A breast cancer that is to be treated can be typed as ER-negative or ER-positive. ER-typing of a breast cancer may be performed by any reproducible means. ER-typing of a breast cancer may be performed as set forth in Onkologie 27: 175-179 (2004). A breast cancer that is to be treated can be typed as PR-unknown, PR-rich or PR-poor. A breast cancer that is to be treated can be typed as PR-negative or PR-positive. A breast cancer that is to be treated can be typed as receptor positive or receptor negative. A breast cancer that is to be treated can be typed as being associated with elevated blood levels of CA 15-3, or CA 27-29, or both.

A breast cancer that is to be treated can include a localized tumor of the breast. A breast cancer that is to be treated can include a tumor of the breast that is associated with a negative sentinel lymph node (SLN) biopsy. A breast cancer that is to be treated can include a tumor of the breast that is associated with a positive sentinel lymph node (SLN) biopsy. A breast cancer that is to be treated can include a tumor of the breast that is associated with one or more positive axillary lymph nodes, where the axillary lymph nodes have been staged by any applicable method. A breast cancer that is to be treated can include a tumor of the breast that has been typed as having nodal negative status (e.g., node-negative) or nodal positive status (e.g., node-positive). A breast cancer that is to be treated can include a tumor of the breast that has metastasized to other locations in the body. A breast cancer that is to be treated can be classified as having metastasized to a location selected from the group consisting of bone, lung, liver, or brain. A breast cancer that is to be treated can be classified according to a characteristic selected from the group consisting of metastatic, localized, regional, local-regional, locally advanced, distant, multicentric, bilateral, ipsilateral, contralateral, newly diagnosed, recurrent, and inoperable.

A compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, may be used to treat or prevent a cell proliferative disorder of the breast, or to treat or prevent breast cancer, in a subject having an increased risk of developing breast cancer relative to the population at large. A subject with an increased risk of developing breast cancer relative to the population at large is a female subject with a family history or personal history of breast cancer. A subject with an increased risk of developing breast cancer relative to the population at large is a female subject having a germ-line or spontaneous mutation in BRCA1 or BRCA2, or both. A subject with an increased risk of developing breast cancer relative to the population at large is a female subject with a family history of breast cancer and a germ-line or spontaneous mutation in BRCA1 or BRCA2, or both. A subject with an increased risk of developing breast cancer relative to the population at large is a female who is greater than 30 years old, greater than 40 years old, greater than 50 years old, greater than 60 years old, greater than 70 years old, greater than 80 years old, or greater than 90 years old. A subject with an increased risk of developing breast cancer relative to the population at large is a subject with atypical hyperplasia of the breast, ductal carcinoma in situ (DCIS), intraductal carcinoma, lobular carcinoma in situ (LCIS), lobular neoplasia, or a stage 0 growth or lesion of the breast (e.g., stage 0 or grade 0 breast cancer, or carcinoma in situ).

A breast cancer that is to be treated can histologically graded according to the Scarff-Bloom-Richardson system, wherein a breast tumor has been assigned a mitosis count score of 1, 2, or 3; a nuclear pleiomorphism score of 1, 2, or 3; a tubule formation score of 1, 2, or 3; and a total Scarff-Bloom-Richardson score of between 3 and 9. A breast cancer that is to be treated can be assigned a tumor grade according to the International Consensus Panel on the Treatment of Breast Cancer selected from the group consisting of grade 1, grade 1-2, grade 2, grade 2-3, or grade 3.

A cancer that is to be treated can be staged according to the American Joint Committee on Cancer (AJCC) TNM classification system, where the tumor (T) has been assigned a stage of TX, T1, T1mic, T1a, T1b, T1c, T2, T3, T4, T4a, T4b, T4c, or T4d; and where the regional lymph nodes (N) have been assigned a stage of NX, N0, N1, N2, N2a, N2b, N3, N3a, N3b, or N3c; and where distant metastasis (M) can be assigned a stage of MX, M0, or M1. A cancer that is to be treated can be staged according to an American Joint Committee on Cancer (AJCC) classification as Stage I, Stage IIA, Stage IIB, Stage IIIA, Stage IIIB, Stage IIIC, or Stage IV. A cancer that is to be treated can be assigned a grade according to an AJCC classification as Grade GX (e.g., grade cannot be assessed), Grade 1, Grade 2, Grade 3 or Grade 4. A cancer that is to be treated can be staged according to an AJCC pathologic classification (pN) of pNX, pN0, PN0 (I−), PN0 (I+), PN0 (mol−), PN0 (mol+), PN1, PN1(mi), PN1a, PN1b, PN1c, pN2, pN2a, pN2b, pN3, pN3a, pN3b, or pN3c.

A cancer that is to be treated can include a tumor that has been determined to be less than or equal to about 2 centimeters in diameter. A cancer that is to be treated can include a tumor that has been determined to be from about 2 to about 5 centimeters in diameter. A cancer that is to be treated can include a tumor that has been determined to be greater than or equal to about 3 centimeters in diameter. A cancer that is to be treated can include a tumor that has been determined to be greater than 5 centimeters in diameter. A cancer that is to be treated can be classified by microscopic appearance as well differentiated, moderately differentiated, poorly differentiated, or undifferentiated. A cancer that is to be treated can be classified by microscopic appearance with respect to mitosis count (e.g., amount of cell division) or nuclear pleiomorphism (e.g., change in cells). A cancer that is to be treated can be classified by microscopic appearance as being associated with areas of necrosis (e.g., areas of dying or degenerating cells). A cancer that is to be treated can be classified as having an abnormal karyotype, having an abnormal number of chromosomes, or having one or more chromosomes that are abnormal in appearance. A cancer that is to be treated can be classified as being aneuploid, triploid, tetraploid, or as having an altered ploidy. A cancer that is to be treated can be classified as having a chromosomal translocation, or a deletion or duplication of an entire chromosome, or a region of deletion, duplication or amplification of a portion of a chromosome.

A cancer that is to be treated can be evaluated by DNA cytometry, flow cytometry, or image cytometry. A cancer that is to be treated can be typed as having 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% of cells in the synthesis stage of cell division (e.g., in S phase of cell division). A cancer that is to be treated can be typed as having a low S-phase fraction or a high S-phase fraction.

As used herein, a “normal cell” is a cell that cannot be classified as part of a “cell proliferative disorder”. A normal cell lacks unregulated or abnormal growth, or both, that can lead to the development of an unwanted condition or disease. Preferably, a normal cell possesses normally functioning cell cycle checkpoint control mechanisms.

As used herein, “contacting a cell” refers to a condition in which a compound or other composition of matter is in direct contact with a cell, or is close enough to induce a desired biological effect in a cell.

As used herein, “candidate compound” refers to a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, that has been or will be tested in one or more in vitro or in vivo biological assays, in order to determine if that compound is likely to elicit a desired biological or medical response in a cell, tissue, system, animal or human that is being sought by a researcher or clinician. A candidate compound is a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof. The biological or medical response can be the treatment of cancer. The biological or medical response can be treatment or prevention of a cell proliferative disorder. In vitro or in vivo biological assays can include, but are not limited to, enzymatic activity assays, electrophoretic mobility shift assays, reporter gene assays, in vitro cell viability assays, and the assays described herein.

As used herein, “monotherapy” refers to the administration of a single active or therapeutic compound to a subject in need thereof. Preferably, monotherapy will involve administration of a therapeutically effective amount of an active compound. For example, cancer monotherapy with one of the compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, to a subject in need of treatment of cancer. Monotherapy may be contrasted with combination therapy, in which a combination of multiple active compounds is administered, preferably with each component of the combination present in a therapeutically effective amount. In one aspect, monotherapy with a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, is more effective than combination therapy in inducing a desired biological effect.

As used herein, “treating” or “treat” describes the management and care of a patient for the purpose of combating a disease, condition, or disorder and includes the administration of a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, to alleviate the symptoms or complications of a disease, condition or disorder, or to eliminate the disease, condition or disorder.

A compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, can also be used to prevent a disease, condition or disorder. As used herein, “preventing” or “prevent” describes reducing or eliminating the onset of the symptoms or complications of the disease, condition or disorder.

As used herein, the term “alleviate” is meant to describe a process by which the severity of a sign or symptom of a disorder is decreased. Importantly, a sign or symptom can be alleviated without being eliminated. In a preferred embodiment, the administration of pharmaceutical compositions of the invention leads to the elimination of a sign or symptom, however, elimination is not required. Effective dosages are expected to decrease the severity of a sign or symptom. For instance, a sign or symptom of a disorder such as cancer, which can occur in multiple locations, is alleviated if the severity of the cancer is decreased within at least one of multiple locations.

As used herein, the term “severity” is meant to describe the potential of cancer to transform from a precancerous, or benign, state into a malignant state. Alternatively, or in addition, severity is meant to describe a cancer stage, for example, according to the TNM system (accepted by the International Union Against Cancer (UICC) and the American Joint Committee on Cancer (AJCC)) or by other art-recognized methods. Cancer stage refers to the extent or severity of the cancer, based on factors such as the location of the primary tumor, tumor size, number of tumors, and lymph node involvement (spread of cancer into lymph nodes). Alternatively, or in addition, severity is meant to describe the tumor grade by art-recognized methods (see, National Cancer Institute). Tumor grade is a system used to classify cancer cells in terms of how abnormal they look under a microscope and how quickly the tumor is likely to grow and spread. Many factors are considered when determining tumor grade, including the structure and growth pattern of the cells. The specific factors used to determine tumor grade vary with each type of cancer. Severity also describes a histologic grade, also called differentiation, which refers to how much the tumor cells resemble normal cells of the same tissue type (see, National Cancer Institute). Furthermore, severity describes a nuclear grade, which refers to the size and shape of the nucleus in tumor cells and the percentage of tumor cells that are dividing (see, National Cancer Institute).

In another aspect of the invention, severity describes the degree to which a tumor has secreted growth factors, degraded the extracellular matrix, become vascularized, lost adhesion to juxtaposed tissues, or metastasized. Moreover, severity describes the number of locations to which a primary tumor has metastasized. Finally, severity includes the difficulty of treating tumors of varying types and locations. For example, inoperable tumors, those cancers which have greater access to multiple body systems (hematological and immunological tumors), and those which are the most resistant to traditional treatments are considered most severe. In these situations, prolonging the life expectancy of the subject and/or reducing pain, decreasing the proportion of cancerous cells or restricting cells to one system, and improving cancer stage/tumor grade/histological grade/nuclear grade are considered alleviating a sign or symptom of the cancer.

As used herein the term “symptom” is defined as an indication of disease, illness, injury, or that something is not right in the body. Symptoms are felt or noticed by the individual experiencing the symptom, but may not easily be noticed by others. Others are defined as non-health-care professionals.

As used herein the term “sign” is also defined as an indication that something is not right in the body. But signs are defined as things that can be seen by a doctor, nurse, or other health care professional.

Cancer is a group of diseases that may cause almost any sign or symptom. The signs and symptoms will depend on where the cancer is, the size of the cancer, and how much it affects the nearby organs or structures. If a cancer spreads (metastasizes), then symptoms may appear in different parts of the body.

As a cancer grows, it begins to push on nearby organs, blood vessels, and nerves. This pressure creates some of the signs and symptoms of cancer. If the cancer is in a critical area, such as certain parts of the brain, even the smallest tumor can cause early symptoms.

But sometimes cancers start in places where it does not cause any symptoms until the cancer has grown quite large. Pancreas cancers, for example, do not usually grow large enough to be felt from the outside of the body. Some pancreatic cancers do not cause symptoms until they begin to grow around nearby nerves (this causes a backache). Others grow around the bile duct, which blocks the flow of bile and leads to a yellowing of the skin known as jaundice. By the time a pancreatic cancer causes these signs or symptoms, it has usually reached an advanced stage.

A cancer may also cause symptoms such as fever, fatigue, or weight loss. This may be because cancer cells use up much of the body's energy supply or release substances that change the body's metabolism. Or the cancer may cause the immune system to react in ways that produce these symptoms.

Sometimes, cancer cells release substances into the bloodstream that cause symptoms not usually thought to result from cancers. For example, some cancers of the pancreas can release substances which cause blood clots to develop in veins of the legs. Some lung cancers make hormone-like substances that affect blood calcium levels, affecting nerves and muscles and causing weakness and dizziness

Cancer presents several general signs or symptoms that occur when a variety of subtypes of cancer cells are present. Most people with cancer will lose weight at some time with their disease. An unexplained (unintentional) weight loss of 10 pounds or more may be the first sign of cancer, particularly cancers of the pancreas, stomach, esophagus, or lung.

Fever is very common with cancer, but is more often seen in advanced disease. Almost all patients with cancer will have fever at some time, especially if the cancer or its treatment affects the immune system and makes it harder for the body to fight infection. Less often, fever may be an early sign of cancer, such as with leukemia or lymphoma.

Fatigue may be an important symptom as cancer progresses. It may happen early, though, in cancers such as with leukemia, or if the cancer is causing an ongoing loss of blood, as in some colon or stomach cancers.

Pain may be an early symptom with some cancers such as bone cancers or testicular cancer. But most often pain is a symptom of advanced disease.

Along with cancers of the skin (see next section), some internal cancers can cause skin signs that can be seen. These changes include the skin looking darker (hyperpigmentation), yellow (jaundice), or red (erythema); itching; or excessive hair growth.

Alternatively, or in addition, cancer subtypes present specific signs or symptoms. Changes in bowel habits or bladder function could indicate cancer. Long-term constipation, diarrhea, or a change in the size of the stool may be a sign of colon cancer. Pain with urination, blood in the urine, or a change in bladder function (such as more frequent or less frequent urination) could be related to bladder or prostate cancer.

Changes in skin condition or appearance of a new skin condition could indicate cancer. Skin cancers may bleed and look like sores that do not heal. A long-lasting sore in the mouth could be an oral cancer, especially in patients who smoke, chew tobacco, or frequently drink alcohol. Sores on the penis or vagina may either be signs of infection or an early cancer.

Unusual bleeding or discharge could indicate cancer. Unusual bleeding can happen in either early or advanced cancer. Blood in the sputum (phlegm) may be a sign of lung cancer. Blood in the stool (or a dark or black stool) could be a sign of colon or rectal cancer. Cancer of the cervix or the endometrium (lining of the uterus) can cause vaginal bleeding. Blood in the urine may be a sign of bladder or kidney cancer. A bloody discharge from the nipple may be a sign of breast cancer.

A thickening or lump in the breast or in other parts of the body could indicate the presence of a cancer. Many cancers can be felt through the skin, mostly in the breast, testicle, lymph nodes (glands), and the soft tissues of the body. A lump or thickening may be an early or late sign of cancer. Any lump or thickening could be indicative of cancer, especially if the formation is new or has grown in size.

Indigestion or trouble swallowing could indicate cancer. While these symptoms commonly have other causes, indigestion or swallowing problems may be a sign of cancer of the esophagus, stomach, or pharynx (throat).

Recent changes in a wart or mole could be indicative of cancer. Any wart, mole, or freckle that changes in color, size, or shape, or loses its definite borders indicates the potential development of cancer. For example, the skin lesion may be a melanoma.

A persistent cough or hoarseness could be indicative of cancer. A cough that does not go away may be a sign of lung cancer. Hoarseness can be a sign of cancer of the larynx (voice box) or thyroid.

While the signs and symptoms listed above are the more common ones seen with cancer, there are many others that are less common and are not listed here. However, all art-recognized signs and symptoms of cancer are contemplated and encompassed by the instant invention.

Treating cancer can result in a reduction in size of a tumor. A reduction in size of a tumor may also be referred to as “tumor regression”. Preferably, after treatment, tumor size is reduced by 5% or greater relative to its size prior to treatment; more preferably, tumor size is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75% or greater. Size of a tumor may be measured by any reproducible means of measurement. The size of a tumor may be measured as a diameter of the tumor.

Treating cancer can result in a reduction in tumor volume. Preferably, after treatment, tumor volume is reduced by 5% or greater relative to its size prior to treatment; more preferably, tumor volume is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75% or greater. Tumor volume may be measured by any reproducible means of measurement.

Treating cancer results in a decrease in number of tumors. Preferably, after treatment, tumor number is reduced by 5% or greater relative to number prior to treatment; more preferably, tumor number is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75%. Number of tumors may be measured by any reproducible means of measurement. The number of tumors may be measured by counting tumors visible to the naked eye or at a specified magnification. Preferably, the specified magnification is 2×, 3×, 4×, 5×, 10×, or 50×.

Treating cancer can result in a decrease in number of metastatic lesions in other tissues or organs distant from the primary tumor site. Preferably, after treatment, the number of metastatic lesions is reduced by 5% or greater relative to number prior to treatment; more preferably, the number of metastatic lesions is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75%. The number of metastatic lesions may be measured by any reproducible means of measurement. The number of metastatic lesions may be measured by counting metastatic lesions visible to the naked eye or at a specified magnification. Preferably, the specified magnification is 2×, 3×, 4×, 5×, 10×, or 50×.

Treating cancer can result in an increase in average survival time of a population of treated subjects in comparison to a population receiving carrier alone. Preferably, the average survival time is increased by more than 30 days; more preferably, by more than 60 days; more preferably, by more than 90 days; and most preferably, by more than 120 days. An increase in average survival time of a population may be measured by any reproducible means. An increase in average survival time of a population may be measured, for example, by calculating for a population the average length of survival following initiation of treatment with an active compound. An increase in average survival time of a population may also be measured, for example, by calculating for a population the average length of survival following completion of a first round of treatment with an active compound.

Treating cancer can result in an increase in average survival time of a population of treated subjects in comparison to a population of untreated subjects. Preferably, the average survival time is increased by more than 30 days; more preferably, by more than 60 days; more preferably, by more than 90 days; and most preferably, by more than 120 days. An increase in average survival time of a population may be measured by any reproducible means. An increase in average survival time of a population may be measured, for example, by calculating for a population the average length of survival following initiation of treatment with an active compound. An increase in average survival time of a population may also be measured, for example, by calculating for a population the average length of survival following completion of a first round of treatment with an active compound.

Treating cancer can result in increase in average survival time of a population of treated subjects in comparison to a population receiving monotherapy with a drug that is not a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof. Preferably, the average survival time is increased by more than 30 days; more preferably, by more than 60 days; more preferably, by more than 90 days; and most preferably, by more than 120 days. An increase in average survival time of a population may be measured by any reproducible means. An increase in average survival time of a population may be measured, for example, by calculating for a population the average length of survival following initiation of treatment with an active compound. An increase in average survival time of a population may also be measured, for example, by calculating for a population the average length of survival following completion of a first round of treatment with an active compound.

Treating cancer can result in a decrease in the mortality rate of a population of treated subjects in comparison to a population receiving carrier alone. Treating cancer can result in a decrease in the mortality rate of a population of treated subjects in comparison to an untreated population. Treating cancer can result in a decrease in the mortality rate of a population of treated subjects in comparison to a population receiving monotherapy with a drug that is not a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof. Preferably, the mortality rate is decreased by more than 2%; more preferably, by more than 5%; more preferably, by more than 10%; and most preferably, by more than 25%. A decrease in the mortality rate of a population of treated subjects may be measured by any reproducible means. A decrease in the mortality rate of a population may be measured, for example, by calculating for a population the average number of disease-related deaths per unit time following initiation of treatment with an active compound. A decrease in the mortality rate of a population may also be measured, for example, by calculating for a population the average number of disease-related deaths per unit time following completion of a first round of treatment with an active compound.

Treating cancer can result in a decrease in tumor growth rate. Preferably, after treatment, tumor growth rate is reduced by at least 5% relative to number prior to treatment; more preferably, tumor growth rate is reduced by at least 10%; more preferably, reduced by at least 20%; more preferably, reduced by at least 30%; more preferably, reduced by at least 40%; more preferably, reduced by at least 50%; even more preferably, reduced by at least 50%; and most preferably, reduced by at least 75%. Tumor growth rate may be measured by any reproducible means of measurement. Tumor growth rate can be measured according to a change in tumor diameter per unit time.

Treating cancer can result in a decrease in tumor regrowth. Preferably, after treatment, tumor regrowth is less than 5%; more preferably, tumor regrowth is less than 10%; more preferably, less than 20%; more preferably, less than 30%; more preferably, less than 40%; more preferably, less than 50%; even more preferably, less than 50%; and most preferably, less than 75%. Tumor regrowth may be measured by any reproducible means of measurement. Tumor regrowth is measured, for example, by measuring an increase in the diameter of a tumor after a prior tumor shrinkage that followed treatment. A decrease in tumor regrowth is indicated by failure of tumors to reoccur after treatment has stopped.

Treating or preventing a cell proliferative disorder can result in a reduction in the rate of cellular proliferation. Preferably, after treatment, the rate of cellular proliferation is reduced by at least 5%; more preferably, by at least 10%; more preferably, by at least 20%; more preferably, by at least 30%; more preferably, by at least 40%; more preferably, by at least 50%; even more preferably, by at least 50%; and most preferably, by at least 75%. The rate of cellular proliferation may be measured by any reproducible means of measurement. The rate of cellular proliferation is measured, for example, by measuring the number of dividing cells in a tissue sample per unit time.

Treating or preventing a cell proliferative disorder can result in a reduction in the proportion of proliferating cells. Preferably, after treatment, the proportion of proliferating cells is reduced by at least 5%; more preferably, by at least 10%; more preferably, by at least 20%; more preferably, by at least 30%; more preferably, by at least 40%; more preferably, by at least 50%; even more preferably, by at least 50%; and most preferably, by at least 75%. The proportion of proliferating cells may be measured by any reproducible means of measurement. Preferably, the proportion of proliferating cells is measured, for example, by quantifying the number of dividing cells relative to the number of nondividing cells in a tissue sample. The proportion of proliferating cells can be equivalent to the mitotic index.

Treating or preventing a cell proliferative disorder can result in a decrease in size of an area or zone of cellular proliferation. Preferably, after treatment, size of an area or zone of cellular proliferation is reduced by at least 5% relative to its size prior to treatment; more preferably, reduced by at least 10%; more preferably, reduced by at least 20%; more preferably, reduced by at least 30%; more preferably, reduced by at least 40%; more preferably, reduced by at least 50%; even more preferably, reduced by at least 50%; and most preferably, reduced by at least 75%. Size of an area or zone of cellular proliferation may be measured by any reproducible means of measurement. The size of an area or zone of cellular proliferation may be measured as a diameter or width of an area or zone of cellular proliferation.

Treating or preventing a cell proliferative disorder can result in a decrease in the number or proportion of cells having an abnormal appearance or morphology. Preferably, after treatment, the number of cells having an abnormal morphology is reduced by at least 5% relative to its size prior to treatment; more preferably, reduced by at least 10%; more preferably, reduced by at least 20%; more preferably, reduced by at least 30%; more preferably, reduced by at least 40%; more preferably, reduced by at least 50%; even more preferably, reduced by at least 50%; and most preferably, reduced by at least 75%. An abnormal cellular appearance or morphology may be measured by any reproducible means of measurement. An abnormal cellular morphology can be measured by microscopy, e.g., using an inverted tissue culture microscope. An abnormal cellular morphology can take the form of nuclear pleiomorphism.

As used herein, the term “selectively” means tending to occur at a higher frequency in one population than in another population. The compared populations can be cell populations. Preferably, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, acts selectively on a cancer or precancerous cell but not on a normal cell. Preferably, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, acts selectively to modulate one molecular target (e.g., a target kinase) but does not significantly modulate another molecular target (e.g., a non-target kinase). The invention also provides a method for selectively inhibiting the activity of an enzyme, such as a kinase. Preferably, an event occurs selectively in population A relative to population B if it occurs greater than two times more frequently in population A as compared to population B. An event occurs selectively if it occurs greater than five times more frequently in population A. An event occurs selectively if it occurs greater than ten times more frequently in population A; more preferably, greater than fifty times; even more preferably, greater than 100 times; and most preferably, greater than 1000 times more frequently in population A as compared to population B. For example, cell death would be said to occur selectively in cancer cells if it occurred greater than twice as frequently in cancer cells as compared to normal cells.

A compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, can modulate the activity of a molecular target (e.g., a target kinase). Modulating refers to stimulating or inhibiting an activity of a molecular target. Preferably, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, modulates the activity of a molecular target if it stimulates or inhibits the activity of the molecular target by at least 2-fold relative to the activity of the molecular target under the same conditions but lacking only the presence of said compound. More preferably, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, modulates the activity of a molecular target if it stimulates or inhibits the activity of the molecular target by at least 5-fold, at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold relative to the activity of the molecular target under the same conditions but lacking only the presence of said compound. The activity of a molecular target may be measured by any reproducible means. The activity of a molecular target may be measured in vitro or in vivo. For example, the activity of a molecular target may be measured in vitro by an enzymatic activity assay or a DNA binding assay, or the activity of a molecular target may be measured in vivo by assaying for expression of a reporter gene.

A compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, does not significantly modulate the activity of a molecular target if the addition of the compound does not stimulate or inhibit the activity of the molecular target by greater than 10% relative to the activity of the molecular target under the same conditions but lacking only the presence of said compound.

As used herein, the term “isozyme selective” means preferential inhibition or stimulation of a first isoform of an enzyme in comparison to a second isoform of an enzyme (e.g., preferential inhibition or stimulation of a kinase isozyme alpha in comparison to a kinase isozyme beta). Preferably, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, demonstrates a minimum of a four fold differential, preferably a ten fold differential, more preferably a fifty fold differential, in the dosage required to achieve a biological effect. Preferably, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, demonstrates this differential across the range of inhibition, and the differential is exemplified at the IC₅₀, i.e., a 50% inhibition, for a molecular target of interest.

Administering a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, to a cell or a subject in need thereof can result in modulation (i.e., stimulation or inhibition) of an activity of a kinase of interest.

The present invention provides methods to assess biological activity of a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof. In one method, an assay based on enzymatic activity can be utilized. In one specific enzymatic activity assay, the enzymatic activity is from a kinase. As used herein, “kinase” refers to a large class of enzymes which catalyze the transfer of the γ-phosphate from ATP to the hydroxyl group on the side chain of Ser/Thr or Tyr in proteins and peptides and are intimately involved in the control of various important cell functions, perhaps most notably: signal transduction, differentiation, and proliferation. There are estimated to be about 2,000 distinct protein kinases in the human body, and although each of these phosphorylates particular protein/peptide substrates, they all bind the same second substrate ATP in a highly conserved pocket. About 50% of the known oncogene products are protein tyrosine kinases (PTKs), and their kinase activity has been shown to lead to cell transformation. Preferably, the kinase assayed is a tyrosine kinase.

A change in enzymatic activity caused by a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, can be measured in the disclosed assays. The change in enzymatic activity can be characterized by the change in the extent of phosphorylation of certain substrates. As used herein, “phosphorylation” refers to the addition of phosphate groups to a substrate, including proteins and organic molecules; and, plays an important role in regulating the biological activities of proteins. Preferably, the phosphorylation assayed and measured involves the addition of phosphate groups to tyrosine residues. The substrate can be a peptide or protein.

In some assays, immunological reagents, e.g., antibodies and antigens, are employed. Fluorescence can be utilized in the measurement of enzymatic activity in some assays. As used herein, “fluorescence” refers to a process through which a molecule emits a photon as a result of absorbing an incoming photon of higher energy by the same molecule. Specific methods for assessing the biological activity of the disclosed compounds are described in the examples.

As used herein, an activity of c-Met refers to any biological function or activity that is carried out by c-Met. For example, a function of c-Met includes phosphorylation of downstream target proteins. Other functions of c-Met include autophosphorylation, binding of adaptor proteins such as Gab-1, Grb-2, Shc, SHP2 and c-Cbl, and activation of signal transducers such as Ras, Src, PI3K, PLC-γ, STATs, ERK1 and 2 and FAK.

Administering a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, to a cell or a subject in need thereof results in modulation (i.e., stimulation or inhibition) of an activity of an intracellular target (e.g., substrate). Several intracellular targets can be modulated with the compounds of the present invention, including, but not limited to, adaptor proteins such as Gab-1, Grb-2, Shc, SHP2 and c-Cbl, and signal transducers such as Ras, Src, PI3K, PLC-γ, STATs, ERK1 and 2 and FAK.

Activating refers to placing a composition of matter (e.g., protein or nucleic acid) in a state suitable for carrying out a desired biological function. A composition of matter capable of being activated also has an unactivated state. An activated composition of matter may have an inhibitory or stimulatory biological function, or both.

Elevation refers to an increase in a desired biological activity of a composition of matter (e.g., a protein or a nucleic acid). Elevation may occur through an increase in concentration of a composition of matter.

As used herein, “a cell cycle checkpoint pathway” refers to a biochemical pathway that is involved in modulation of a cell cycle checkpoint. A cell cycle checkpoint pathway may have stimulatory or inhibitory effects, or both, on one or more functions comprising a cell cycle checkpoint. A cell cycle checkpoint pathway is comprised of at least two compositions of matter, preferably proteins, both of which contribute to modulation of a cell cycle checkpoint. A cell cycle checkpoint pathway may be activated through an activation of one or more members of the cell cycle checkpoint pathway. Preferably, a cell cycle checkpoint pathway is a biochemical signaling pathway.

As used herein, “cell cycle checkpoint regulator” refers to a composition of matter that can function, at least in part, in modulation of a cell cycle checkpoint. A cell cycle checkpoint regulator may have stimulatory or inhibitory effects, or both, on one or more functions comprising a cell cycle checkpoint. A cell cycle checkpoint regulator can be a protein or not a protein.

Treating cancer or a cell proliferative disorder can result in cell death, and preferably, cell death results in a decrease of at least 10% in number of cells in a population. More preferably, cell death means a decrease of at least 20%; more preferably, a decrease of at least 30%; more preferably, a decrease of at least 40%; more preferably, a decrease of at least 50%; most preferably, a decrease of at least 75%. Number of cells in a population may be measured by any reproducible means. A number of cells in a population can be measured by fluorescence activated cell sorting (FACS), immunofluorescence microscopy and light microscopy. Methods of measuring cell death are as shown in Li et al., Proc Natl Acad Sci USA. 100(5): 2674-8, 2003. In an aspect, cell death occurs by apoptosis.

Preferably, an effective amount of a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, is not significantly cytotoxic to normal cells. A therapeutically effective amount of a compound is not significantly cytotoxic to normal cells if administration of the compound in a therapeutically effective amount does not induce cell death in greater than 10% of normal cells. A therapeutically effective amount of a compound does not significantly affect the viability of normal cells if administration of the compound in a therapeutically effective amount does not induce cell death in greater than 10% of normal cells. In an aspect, cell death occurs by apoptosis.

Contacting a cell with a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, can induce or activate cell death selectively in cancer cells. Administering to a subject in need thereof a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, can induce or activate cell death selectively in cancer cells. Contacting a cell with a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, can induce cell death selectively in one or more cells affected by a cell proliferative disorder. Preferably, administering to a subject in need thereof a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, induces cell death selectively in one or more cells affected by a cell proliferative disorder.

The present invention relates to a method of treating or preventing cancer by administering a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, to a subject in need thereof, where administration of the compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, results in one or more of the following: accumulation of cells in G1 and/or S phase of the cell cycle, cytotoxicity via cell death in cancer cells without a significant amount of cell death in normal cells, antitumor activity in animals with a therapeutic index of at least 2, and activation of a cell cycle checkpoint. As used herein, “therapeutic index” is the maximum tolerated dose divided by the efficacious dose.

One skilled in the art may refer to general reference texts for detailed descriptions of known techniques discussed herein or equivalent techniques. These texts include Ausubel et al., Current Protocols in Molecular Biology, John Wiley and Sons, Inc. (2005); Sambrook et al., Molecular Cloning, A Laboratory Manual (3^(rd) edition), Cold Spring Harbor Press, Cold Spring Harbor, N.Y. (2000); Coligan et al., Current Protocols in Immunology, John Wiley & Sons, N.Y.; Enna et al., Current Protocols in Pharmacology, John Wiley & Sons, N.Y.; Fingl et al., The Pharmacological Basis of Therapeutics (1975), Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pa., 18^(th) edition (1990). These texts can, of course, also be referred to in making or using an aspect of the invention

As used herein, “combination therapy” or “co-therapy” includes the administration of a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, and at least a second agent as part of a specific treatment regimen intended to provide the beneficial effect from the co-action of these therapeutic agents. The beneficial effect of the combination includes, but is not limited to, pharmacokinetic or pharmacodynamic co-action resulting from the combination of therapeutic agents. Administration of these therapeutic agents in combination typically is carried out over a defined time period (usually minutes, hours, days or weeks depending upon the combination selected). “Combination therapy” may be, but generally is not, intended to encompass the administration of two or more of these therapeutic agents as part of separate monotherapy regimens that incidentally and arbitrarily result in the combinations of the present invention.

“Combination therapy” is intended to embrace administration of these therapeutic agents in a sequential manner, wherein each therapeutic agent is administered at a different time, as well as administration of these therapeutic agents, or at least two of the therapeutic agents, in a substantially simultaneous manner. Substantially simultaneous administration can be accomplished, for example, by administering to the subject a single capsule having a fixed ratio of each therapeutic agent or in multiple, single capsules for each of the therapeutic agents. Sequential or substantially simultaneous administration of each therapeutic agent can be effected by any appropriate route including, but not limited to, oral routes, intravenous routes, intramuscular routes, and direct absorption through mucous membrane tissues. The therapeutic agents can be administered by the same route or by different routes. For example, a first therapeutic agent of the combination selected may be administered by intravenous injection while the other therapeutic agents of the combination may be administered orally. Alternatively, for example, all therapeutic agents may be administered orally or all therapeutic agents may be administered by intravenous injection. The sequence in which the therapeutic agents are administered is not narrowly critical.

“Combination therapy” also embraces the administration of the therapeutic agents as described above in further combination with other biologically active ingredients and non-drug therapies (e.g., surgery or radiation treatment). Where the combination therapy further comprises a non-drug treatment, the non-drug treatment may be conducted at any suitable time so long as a beneficial effect from the co-action of the combination of the therapeutic agents and non-drug treatment is achieved. For example, in appropriate cases, the beneficial effect is still achieved when the non-drug treatment is temporally removed from the administration of the therapeutic agents, perhaps by days or even weeks.

A compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, may be administered in combination with a second chemotherapeutic agent. The second chemotherapeutic agent (also referred to as an anti-neoplastic agent or anti-proliferative agent) can be an alkylating agent; an antibiotic; an anti-metabolite; a detoxifying agent; an interferon; a polyclonal or monoclonal antibody; an EGFR inhibitor; a HER2 inhibitor; a histone deacetylase inhibitor; a hormone; a mitotic inhibitor; an MTOR inhibitor; a multi-kinase inhibitor; a serine/threonine kinase inhibitor; a tyrosine kinase inhibitors; a VEGF/VEGFR inhibitor; a taxane or taxane derivative, an aromatase inhibitor, an anthracycline, a microtubule targeting drug, a topoisomerase poison drug, an inhibitor of a molecular target or enzyme (e.g., a kinase inhibitor), a cytidine analogue drug or any chemotherapeutic, anti-neoplastic or anti-proliferative agent listed in www.cancer.org/docroot/cdg/cdg_(—)0.asp.

Exemplary alkylating agents include, but are not limited to, cyclophosphamide (Cytoxan; Neosar); chlorambucil (Leukeran); melphalan (Alkeran); carmustine (BiCNU); busulfan (Busulfex); lomustine (CeeNU); dacarbazine (DTIC-Dome); oxaliplatin (Eloxatin); carmustine (Gliadel); Ifosfamide (Ifex); mechlorethamine (Mustargen); busulfan (Myleran); carboplatin (Paraplatin); cisplatin (CDDP; Platinol); temozolomide (Temodar); thiotepa (Thioplex); bendamustine (Treanda); or streptozocin (Zanosar).

Exemplary antibiotics include, but are not limited to, doxorubicin (Adriamycin); doxorubicin liposomal (Doxil); mitoxantrone (Novantrone); bleomycin (Blenoxane); daunorubicin (Cerubidine); daunorubicin liposomal (DaunoXome); dactinomycin (Cosmegen); epirubicin (Ellence); idarubicin (Idamycin); plicamycin (Mithracin); mitomycin (Mutamycin); pentostatin (Nipent); or valrubicin (Valstar).

Exemplary anti-metabolites include, but are not limited to, fluorouracil (Adrucil); capecitabine (Xeloda); hydroxyurea (Hydrea); mercaptopurine (Purinethol); pemetrexed (Alimta); fludarabine (Fludara); nelarabine (Arranon); cladribine (Cladribine Novaplus); clofarabine (Clolar); cytarabine (Cytosar-U); decitabine (Dacogen); cytarabine liposomal (DepoCyt); hydroxyurea (Droxia); pralatrexate (Folotyn); floxuridine (FUDR); gemcitabine (Gemzar); cladribine (Leustatin); fludarabine (Oforta); methotrexate (MTX; Rheumatrex); methotrexate (Trexall); thioguanine (Tabloid); TS-1 or cytarabine (Tarabine PFS).

Exemplary detoxifying agents include, but are not limited to, amifostine (Ethyol) or mesna (Mesnex).

Exemplary interferons include, but are not limited to, interferon alfa-2b (Intron A) or interferon alfa-2a (Roferon-A).

Exemplary polyclonal or monoclonal antibodies include, but are not limited to, trastuzumab (Herceptin); ofatumumab (Arzerra); bevacizumab (Avastin); rituximab (Rituxan); cetuximab (Erbitux); panitumumab (Vectibix); tositumomab/iodine¹³¹ tositumomab (Bexxar); alemtuzumab (Campath); ibritumomab (Zevalin; In-111; Y-90 Zevalin); gemtuzumab (Mylotarg); eculizumab (Soliris) ordenosumab.

Exemplary EGFR inhibitors include, but are not limited to, gefitinib (Iressa); lapatinib (Tykerb); cetuximab (Erbitux); erlotinib (Tarceva); panitumumab (Vectibix); PKI-166; canertinib (CI-1033); matuzumab (Emd7200) or EKB-569.

Exemplary HER2 inhibitors include, but are not limited to, trastuzumab (Herceptin); lapatinib (Tykerb) or AC-480.

Histone Deacetylase Inhibitors include, but are not limited to, vorinostat (Zolinza).

Exemplary hormones include, but are not limited to, tamoxifen (Soltamox; Nolvadex); raloxifene (Evista); megestrol (Megace); leuprolide (Lupron; Lupron Depot; Eligard; Viadur); fulvestrant (Faslodex); letrozole (Ferrara); triptorelin (Trelstar LA; Trelstar Depot); exemestane (Aromasin); goserelin (Zoladex); bicalutamide (Casodex); anastrozole (Arimidex); fluoxymesterone (Androxy; Halotestin); medroxyprogesterone (Provera; Depo-Provera); estramustine (Emcyt); flutamide (Eulexin); toremifene (Fareston); degarelix (Firmagon); nilutamide (Nilandron); abarelix (Plenaxis); or testolactone (Teslac).

Exemplary mitotic inhibitors include, but are not limited to, paclitaxel (Taxol; Onxol; Abraxane); docetaxel (Taxotere); vincristine (Oncovin; Vincasar PFS); vinblastine (Velban); etoposide (Toposar; Etopophos; VePesid); teniposide (Vumon); ixabepilone (Ixempra); nocodazole; epothilone; vinorelbine (Navelbine); camptothecin (CPT); irinotecan (Camptosar); topotecan (Hycamtin); amsacrine or lamellarin D (LAM-D).

Exemplary MTOR inhibitors include, but are not limited to, everolimus (Afinitor) or temsirolimus (Torisel); rapamune, ridaforolimus; or AP23573.

Exemplary multi-kinase inhibitors include, but are not limited to, sorafenib (Nexavar); sunitinib (Sutent); BIBW 2992; E7080; Zd6474; PKC-412; motesanib; or AP24534.

Exemplary serine/threonine kinase inhibitors include, but are not limited to, ruboxistaurin; eril/easudil hydrochloride; flavopiridol; seliciclib (CYC202; Roscovitrine); SNS-032 (BMS-387032); Pkc412; bryostatin; KAI-9803; SF1126; VX-680; Azd1152; Arry-142886 (AZD-6244); SCIO-469; GW681323; CC-401; CEP-1347 or PD 332991.

Exemplary tyrosine kinase inhibitors include, but are not limited to, erlotinib (Tarceva); gefitinib (Iressa); imatinib (Gleevec); sorafenib (Nexavar); sunitinib (Sutent); trastuzumab (Herceptin); bevacizumab (Avastin); rituximab (Rituxan); lapatinib (Tykerb); cetuximab (Erbitux); panitumumab (Vectibix); everolimus (Afinitor); alemtuzumab (Campath); gemtuzumab (Mylotarg); temsirolimus (Torisel); pazopanib (Votrient); dasatinib (Sprycel); nilotinib (Tasigna); vatalanib (Ptk787; ZK222584); CEP-701; SU5614; MLN518; XL999; VX-322; Azd0530; BMS-354825; SKI-606 CP-690; AG-490; WHI-P154; WHI-P131; AC-220; or AMG888.

Exemplary VEGF/VEGFR inhibitors include, but are not limited to, bevacizumab (Avastin); sorafenib (Nexavar); sunitinib (Sutent); ranibizumab; pegaptanib; or vandetinib.

Exemplary microtubule targeting drugs include, but are not limited to, paclitaxel, docetaxel, vincristin, vinblastin, nocodazole, epothilones and navelbine.

Exemplary topoisomerase poison drugs include, but are not limited to, teniposide, etoposide, adriamycin, camptothecin, daunorubicin, dactinomycin, mitoxantrone, amsacrine, epirubicin and idarubicin.

Exemplary taxanes or taxane derivatives include, but are not limited to, paclitaxel and docetaxol.

Exemplary general chemotherapeutic, anti-neoplastic, anti-proliferative agents include, but are not limited to, altretamine (Hexylen); isotretinoin (Accutane; Amnesteem; Claravis; Sotret); tretinoin (Vesanoid); azacitidine (Vidaza); bortezomib (Velcade) asparaginase (Elspar); levamisole (Ergamisol); mitotane (Lysodren); procarbazine (Matulane); pegaspargase (Oncaspar); denileukin diftitox (Ontak); porfimer (Photofrin); aldesleukin (Proleukin); lenalidomide (Revlimid); bexarotene (Targretin); thalidomide (Thalomid); temsirolimus (Torisel); arsenic trioxide (Trisenox); verteporfin (Visudyne); mimosine (Leucenol); (1M tegafur—0.4 M 5-chloro-2,4-dihydroxypyrimidine—1 M potassium oxonate) or lovastatin.

In another aspect, the second chemotherapeutic agent can be a cytokine such as G-CSF (granulocyte colony stimulating factor). In another aspect, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, may be administered in combination with radiation therapy. Radiation therapy can also be administered in combination with a compound of the present invention and another chemotherapeutic agent described herein as part of a multiple agent therapy. In yet another aspect, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof, may be administered in combination with standard chemotherapy combinations such as, but not restricted to, CMF (cyclophosphamide, methotrexate and 5-fluorouracil), CAF (cyclophosphamide, adriamycin and 5-fluorouracil), AC (adriamycin and cyclophosphamide), FEC (5-fluorouracil, epirubicin, and cyclophosphamide), ACT or ATC (adriamycin, cyclophosphamide, and paclitaxel), rituximab, Xeloda (capecitabine), Cisplatin (CDDP), Carboplatin, TS-1 (tegafur, gimestat and otastat potassium at a molar ratio of 1:0.4:1), Camptothecin-11 (CPT-11, Irinotecan or Camptosar™) or CMFP (cyclophosphamide, methotrexate, 5-fluorouracil and prednisone).

In preferred embodiments, a compound of the present invention, or a pharmaceutically acceptable salt, prodrug, metabolite, polymorph or solvate thereof, may be administered with an inhibitor of an enzyme, such as a receptor or non-receptor kinase. Receptor and non-receptor kinases of the invention are, for example, tyrosine kinases or serine/threonine kinases. Kinase inhibitors of the invention are small molecules, polynucleic acids, polypeptides, or antibodies.

Exemplary kinase inhibitors include, but are not limited to, Bevacizumab (targets VEGF), BIBW 2992 (targets EGFR and Erb2), Cetuximab/Erbitux (targets Erb1), Imatinib/Gleevic (targets Bcr-Abl), Trastuzumab (targets Erb2), Gefitinib/Iressa (targets EGFR), Ranibizumab (targets VEGF), Pegaptanib (targets VEGF), Erlotinib/Tarceva (targets Erb1), Nilotinib (targets Bcr-Abl), Lapatinib (targets Erb1 and Erb2/Her2), GW-572016/lapatinib ditosylate (targets HER2/Erb2), Panitumumab/Vectibix (targets EGFR), Vandetinib (targets RET/VEGFR), E7080 (multiple targets including RET and VEGFR), Herceptin (targets HER2/Erb2), PKI-166 (targets EGFR), Canertinib/CI-1033 (targets EGFR), Sunitinib/SU-11464/Sutent (targets EGFR and FLT3), Matuzumab/Emd7200 (targets EGFR), EKB-569 (targets EGFR), Zd6474 (targets EGFR and VEGFR), PKC-412 (targets VEGR and FLT3), Vatalanib/Ptk787/ZK222584 (targets VEGR), CEP-701 (targets FLT3), SU5614 (targets FLT3), MLN518 (targets FLT3), XL999 (targets FLT3), VX-322 (targets FLT3), Azd0530 (targets SRC), BMS-354825 (targets SRC), SKI-606 (targets SRC), CP-690 (targets JAK), AG-490 (targets JAK), WHI-P154 (targets JAK), WHI-P131 (targets JAK), sorafenib/Nexavar (targets RAF kinase, VEGFR-1, VEGFR-2, VEGFR-3, PDGFR-13, KIT, FLT-3, and RET), Dasatinib/Sprycel (BCR/ABL and Src), AC-220 (targets Flt3), AC-480 (targets all HER proteins, “panHER”), Motesanib diphosphate (targets VEGF1-3, PDGFR, and c-kit), Denosumab (targets RANKL, inhibits SRC), AMG888 (targets HER3), and AP24534 (multiple targets including Flt3).

Exemplary serine/threonine kinase inhibitors include, but are not limited to, Rapamune (targets mTOR/FRAP1), Deforolimus (targets mTOR), Certican/Everolimus (targets mTOR/FRAP1), AP23573 (targets mTOR/FRAP1), Eril/Fasudil hydrochloride (targets RHO), Flavopiridol (targets CDK), Seliciclib/CYC202/Roscovitrine (targets CDK), SNS-032/BMS-387032 (targets CDK), Ruboxistaurin (targets PKC), Pkc412 (targets PKC), Bryostatin (targets PKC), KAI-9803 (targets PKC), SF1126 (targets PI3K), VX-680 (targets Aurora kinase), Azd1152 (targets Aurora kinase), Arry-142886/AZD-6244 (targets MAP/MEK), SCID-469 (targets MAP/MEK), GW681323 (targets MAP/MEK), CC-401 (targets JNK), CEP-1347 (targets JNK), and PD 332991 (targets CDK).

4. Pharmaceutical Compositions

The present invention also provides pharmaceutical compositions comprising a compound of each of the formulae described herein in combination with at least one pharmaceutically acceptable excipient or carrier.

A “pharmaceutical composition” is a formulation containing the compounds of the present invention in a form suitable for administration to a subject. In one embodiment, the pharmaceutical composition is in bulk or in unit dosage form. The unit dosage form is any of a variety of forms, including, for example, a capsule, an IV bag, a tablet, a single pump on an aerosol inhaler or a vial. The quantity of active ingredient (e.g., a formulation of the disclosed compound or salt, hydrate, solvate or isomer thereof) in a unit dose of composition is an effective amount and is varied according to the particular treatment involved. One skilled in the art will appreciate that it is sometimes necessary to make routine variations to the dosage depending on the age and condition of the patient. The dosage will also depend on the route of administration. A variety of routes are contemplated, including oral, pulmonary, rectal, parenteral, transdermal, subcutaneous, intravenous, intramuscular, intraperitoneal, inhalational, buccal, sublingual, intrapleural, intrathecal, intranasal, and the like. Dosage forms for the topical or transdermal administration of a compound of this invention include powders, sprays, ointments, pastes, creams, lotions, gels, solutions, patches and inhalants. In one embodiment, the active compound is mixed under sterile conditions with a pharmaceutically acceptable carrier, and with any preservatives, buffers or propellants that are required.

As used herein, the phrase “pharmaceutically acceptable” refers to those compounds, materials, compositions, carriers, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.

“Pharmaceutically acceptable excipient” means an excipient that is useful in preparing a pharmaceutical composition that is generally safe, non-toxic and neither biologically nor otherwise undesirable, and includes excipient that is acceptable for veterinary use as well as human pharmaceutical use. A “pharmaceutically acceptable excipient” as used in the specification and claims includes both one and more than one such excipient.

A pharmaceutical composition of the invention is formulated to be compatible with its intended route of administration. Examples of routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), and transmucosal administration. Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates, and agents for the adjustment of tonicity such as sodium chloride or dextrose. The pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide. The parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic.

A compound or pharmaceutical composition of the invention can be administered to a subject in many of the well-known methods currently used for chemotherapeutic treatment. For example, for treatment of cancers, a compound of the invention may be injected directly into tumors, injected into the blood stream or body cavities or taken orally or applied through the skin with patches. The dose chosen should be sufficient to constitute effective treatment but not as high as to cause unacceptable side effects. The state of the disease condition (e.g., cancer, precancer, and the like) and the health of the patient should preferably be closely monitored during and for a reasonable period after treatment.

The term “therapeutically effective amount”, as used herein, refers to an amount of a pharmaceutical agent to treat, ameliorate, or prevent an identified disease or condition, or to exhibit a detectable therapeutic or inhibitory effect. The effect can be detected by any assay method known in the art. The precise effective amount for a subject will depend upon the subject's body weight, size, and health; the nature and extent of the condition; and the therapeutic or combination of therapeutics selected for administration. Therapeutically effective amounts for a given situation can be determined by routine experimentation that is within the skill and judgment of the clinician. In a preferred aspect, the disease or condition to be treated is cancer. In another aspect, the disease or condition to be treated is a cell proliferative disorder.

For any compound, the therapeutically effective amount can be estimated initially either in cell culture assays, e.g., of neoplastic cells, or in animal models, usually rats, mice, rabbits, dogs, or pigs. The animal model may also be used to determine the appropriate concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans. Therapeutic/prophylactic efficacy and toxicity may be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., ED₅₀ (the dose therapeutically effective in 50% of the population) and LD₅₀ (the dose lethal to 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index, and it can be expressed as the ratio, LD₅₀/ED₅₀. Pharmaceutical compositions that exhibit large therapeutic indices are preferred. The dosage may vary within this range depending upon the dosage form employed, sensitivity of the patient, and the route of administration.

Dosage and administration are adjusted to provide sufficient levels of the active agent(s) or to maintain the desired effect. Factors which may be taken into account include the severity of the disease state, general health of the subject, age, weight, and gender of the subject, diet, time and frequency of administration, drug combination(s), reaction sensitivities, and tolerance/response to therapy. Long-acting pharmaceutical compositions may be administered every 3 to 4 days, every week, or once every two weeks depending on half-life and clearance rate of the particular formulation.

The pharmaceutical compositions containing active compounds of the present invention may be manufactured in a manner that is generally known, e.g., by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping, or lyophilizing processes. Pharmaceutical compositions may be formulated in a conventional manner using one or more pharmaceutically acceptable carriers comprising excipients and/or auxiliaries that facilitate processing of the active compounds into preparations that can be used pharmaceutically. Of course, the appropriate formulation is dependent upon the route of administration chosen.

Pharmaceutical compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. For intravenous administration, suitable carriers include physiological saline, bacteriostatic water, Cremophor EL™ (BASF, Parsippany, N.J.) or phosphate buffered saline (PBS). In all cases, the composition must be sterile and should be fluid to the extent that easy syringeability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition. Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.

Sterile injectable solutions can be prepared by incorporating the active compound in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the active compound into a sterile vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, methods of preparation are vacuum drying and freeze-drying that yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.

Oral compositions generally include an inert diluent or an edible pharmaceutically acceptable carrier. They can be enclosed in gelatin capsules or compressed into tablets. For the purpose of oral therapeutic administration, the active compound can be incorporated with excipients and used in the form of tablets, troches, or capsules. Oral compositions can also be prepared using a fluid carrier for use as a mouthwash, wherein the compound in the fluid carrier is applied orally and swished and expectorated or swallowed. Pharmaceutically compatible binding agents, and/or adjuvant materials can be included as part of the composition. The tablets, pills, capsules, troches and the like can contain any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring.

For administration by inhalation, the compounds are delivered in the form of an aerosol spray from pressured container or dispenser, which contains a suitable propellant, e.g., a gas such as carbon dioxide, or a nebulizer.

Systemic administration can also be by transmucosal or transdermal means. For transmucosal or transdermal administration, penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid derivatives. Transmucosal administration can be accomplished through the use of nasal sprays or suppositories. For transdermal administration, the active compounds are formulated into ointments, salves, gels, or creams as generally known in the art.

The active compounds can be prepared with pharmaceutically acceptable carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems. Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art. The materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc. Liposomal suspensions (including liposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Pat. No. 4,522,811.

It is especially advantageous to formulate oral or parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subject to be treated; each unit containing a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. The specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved.

In therapeutic applications, the dosages of the pharmaceutical compositions used in accordance with the invention vary depending on the agent, the age, weight, and clinical condition of the recipient patient, and the experience and judgment of the clinician or practitioner administering the therapy, among other factors affecting the selected dosage. Generally, the dose should be sufficient to result in slowing, and preferably regressing, the growth of the tumors and also preferably causing complete regression of the cancer. Dosages can range from about 0.01 mg/kg per day to about 5000 mg/kg per day. In preferred aspects, dosages can range from about 1 mg/kg per day to about 1000 mg/kg per day. In an aspect, the dose will be in the range of about 0.1 mg/day to about 50 g/day; about 0.1 mg/day to about 25 g/day; about 0.1 mg/day to about 10 g/day; about 0.1 mg to about 3 g/day; or about 0.1 mg to about 1 g/day, in single, divided, or continuous doses (which dose may be adjusted for the patient's weight in kg, body surface area in m², and age in years). An effective amount of a pharmaceutical agent is that which provides an objectively identifiable improvement as noted by the clinician or other qualified observer. For example, regression of a tumor in a patient may be measured with reference to the diameter of a tumor. Decrease in the diameter of a tumor indicates regression. Regression is also indicated by failure of tumors to reoccur after treatment has stopped. As used herein, the term “dosage effective manner” refers to amount of an active compound to produce the desired biological effect in a subject or cell.

The pharmaceutical compositions can be included in a container, pack, or dispenser together with instructions for administration.

The compounds of the present invention are capable of further forming salts. All of these forms are also contemplated within the scope of the claimed invention.

As used herein, “pharmaceutically acceptable salts” refer to derivatives of the compounds of the present invention wherein the parent compound is modified by making acid or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic residues such as amines, alkali or organic salts of acidic residues such as carboxylic acids, and the like. The pharmaceutically acceptable salts include the conventional non-toxic salts or the quaternary ammonium salts of the parent compound formed, for example, from non-toxic inorganic or organic acids. For example, such conventional non-toxic salts include, but are not limited to, those derived from inorganic and organic acids selected from 2-acetoxybenzoic, 2-hydroxyethane sulfonic, acetic, ascorbic, benzene sulfonic, benzoic, bicarbonic, carbonic, citric, edetic, ethane disulfonic, 1,2-ethane sulfonic, fumaric, glucoheptonic, gluconic, glutamic, glycolic, glycollyarsanilic, hexylresorcinic, hydrabamic, hydrobromic, hydrochloric, hydroiodic, hydroxymaleic, hydroxynaphthoic, isethionic, lactic, lactobionic, lauryl sulfonic, maleic, malic, mandelic, methane sulfonic, napsylic, nitric, oxalic, pamoic, pantothenic, phenylacetic, phosphoric, polygalacturonic, propionic, salicyclic, stearic, subacetic, succinic, sulfamic, sulfanilic, sulfuric, tannic, tartaric, toluene sulfonic, and the commonly occurring amine acids, e.g., glycine, alanine, phenylalanine, arginine, etc.

Other examples of pharmaceutically acceptable salts include hexanoic acid, cyclopentane propionic acid, pyruvic acid, malonic acid, 3-(4-hydroxybenzoyl)benzoic acid, cinnamic acid, 4-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo-[2.2.2]-oct-2-ene-1-carboxylic acid, 3-phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, muconic acid, and the like. The present invention also encompasses salts formed when an acidic proton present in the parent compound either is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine, diethanolamine, triethanolamine, tromethamine, N-methylglucamine, and the like.

It should be understood that all references to pharmaceutically acceptable salts include solvent addition forms (solvates) or crystal forms (polymorphs) as defined herein, of the same salt.

The compounds of the present invention can also be prepared as esters, for example, pharmaceutically acceptable esters. For example, a carboxylic acid function group in a compound can be converted to its corresponding ester, e.g., a methyl, ethyl or other ester. Also, an alcohol group in a compound can be converted to its corresponding ester, e.g., an acetate, propionate or other ester.

The compounds of the present invention can also be prepared as prodrugs, for example, pharmaceutically acceptable prodrugs. The terms “pro-drug” and “prodrug” are used interchangeably herein and refer to any compound which releases an active parent drug in vivo. Since prodrugs are known to enhance numerous desirable qualities of pharmaceuticals (e.g., solubility, bioavailability, manufacturing, etc.), the compounds of the present invention can be delivered in prodrug form. Thus, the present invention is intended to cover prodrugs of the presently claimed compounds, methods of delivering the same and compositions containing the same. “Prodrugs” are intended to include any covalently bonded carriers that release an active parent drug of the present invention in vivo when such prodrug is administered to a subject. Prodrugs in the present invention are prepared by modifying functional groups present in the compound in such a way that the modifications are cleaved, either in routine manipulation or in vivo, to the parent compound. Prodrugs include compounds of the present invention wherein a hydroxy, amino, sulfhydryl, carboxy or carbonyl group is bonded to any group that may be cleaved in vivo to form a free hydroxyl, free amino, free sulfhydryl, free carboxy or free carbonyl group, respectively.

Examples of prodrugs include, but are not limited to, esters (e.g., acetate, dialkylaminoacetates, formates, phosphates, sulfates and benzoate derivatives) and carbamates (e.g., N,N-dimethylaminocarbonyl) of hydroxy functional groups, esters (e.g., ethyl esters, morpholinoethanol esters) of carboxyl functional groups, N-acyl derivatives (e.g., N-acetyl) N-Mannich bases, Schiff bases and enaminones of amino functional groups, oximes, acetals, ketals and enol esters of ketone and aldehyde functional groups in compounds of the invention, and the like, See Bundegaard, H., Design of Prodrugs, p 1-92, Elesevier, N.Y.—Oxford (1985).

The compounds, or pharmaceutically acceptable salts, esters or prodrugs thereof, are administered orally, nasally, transdermally, pulmonary, inhalationally, buccally, sublingually, intraperintoneally, subcutaneously, intramuscularly, intravenously, rectally, intrapleurally, intrathecally and parenterally. In one embodiment, the compound is administered orally. One skilled in the art will recognize the advantages of certain routes of administration.

The dosage regimen utilizing the compounds is selected in accordance with a variety of factors including type, species, age, weight, sex and medical condition of the patient; the severity of the condition to be treated; the route of administration; the renal and hepatic function of the patient; and the particular compound or salt thereof employed. An ordinarily skilled physician or veterinarian can readily determine and prescribe the effective amount of the drug required to prevent, counter or arrest the progress of the condition.

Techniques for formulation and administration of the disclosed compounds of the invention can be found in Remington: the Science and Practice of Pharmacy, 19^(th) edition, Mack Publishing Co., Easton, Pa. (1995). In an embodiment, the compounds described herein, and the pharmaceutically acceptable salts thereof, are used in pharmaceutical preparations in combination with a pharmaceutically acceptable carrier or diluent. Suitable pharmaceutically acceptable carriers include inert solid fillers or diluents and sterile aqueous or organic solutions. The compounds will be present in such pharmaceutical compositions in amounts sufficient to provide the desired dosage amount in the range described herein.

All percentages and ratios used herein, unless otherwise indicated, are by weight. Other features and advantages of the present invention are apparent from the different examples. The provided examples illustrate different components and methodology useful in practicing the present invention. The examples do not limit the claimed invention. Based on the present disclosure the skilled artisan can identify and employ other components and methodology useful for practicing the present invention.

5. Examples Example 1 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-[(2S)-2-hydroxypropyl]benzamide hydrochloride Step 1: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

To a solution of 2,6-dichloro-3-nitropyridine (54 g) in THF (1200 mL), were added ethyl diisopropylamine (1.05 eq.) and tert-butyl [1-(4-aminophenyl)cyclobutyl]carbamate (74 g) at −14° C. and the mixture was warmed up to 25° C. The mixture was stirred for 24 h and diluted with ethyl acetate (1 L) and water (750 mL). The separated organic phase was washed with brine and dried over anhydrous Na₂SO₄. The solvent was removed and the residue was solidified with ethyl acetate/hexane (1:1) to give tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate (89 g).

To a suspension of tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate (10 g, 24 mmol) in DMSO/MeOH (4:1, 200 mL), were added 2-aminonicotinaldehyde (3.5 g, 29 mmol) and sodium dithionite (16 g, 93 mmol) and the mixture was heated for 48 h at 100° C. The mixture was poured into water and the solid was collected by filtration. The solid was purified by silica gel column chromatography (dichloromethane/ethyl acetate, 10:0 to 0:10) to give the titled compound as a white solid (2.5 g, 21%).

¹H-NMR (DMSO-D₆) δ: 8.26 (1H, d, J=8.0 Hz), 7.98 (1H, dd, J=4.9, 2.0 Hz), 7.52 (2H, dd, J=6.6, 2.0 Hz), 7.45 (1H, d, J=8.6 Hz), 7.42-7.36 (2H, m), 7.16-7.10 (1H, m), 7.03-6.94 (2H, m), 6.30 (1H, dd, J=7.7, 4.9 Hz), 2.48-2.35 (4H, m), 2.08-1.95 (1H, m), 1.88-1.76 (1H, m), 1.41-1.05 (9H, m), LC/MS: 491 [M+H].

Step 2: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-[(2S)-2-hydroxypropyl]benzamide hydrochloride

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate was reacted using general procedure G and B to give the titled compound.

¹H-NMR (DMSO-d6) δ: 8.96-8.80 (2H, m), 8.68-8.62 (1H, m), 8.51 (1H, br s), 8.43 (1H, d, J=8.59 Hz), 8.19-8.15 (3H, m), 7.94-7.85 (2H, m), 7.78-7.73 (2H, m), 7.70 (2H, d, J=8.59 Hz), 7.57 (1H, t, J=7.73 Hz), 6.93-6.87 (1H, m), 3.84-3.79 (1H, m), 3.28-3.17 (2H, m), 2.67-2.59 (4H, m), 2.27-2.20 (1H, m), 1.90-1.82 (1H, m), 1.09 (3H, d, J=6.30 Hz). LCMS: 534 [M+H].

Example 2 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-[(2R)-2-hydroxypropyl]benzamide hydrochloride

3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-[(2R)-2-hydroxypropyl]benzamide hydrochloride was synthesized by the procedure described in Example 1 using the S isomer

¹H-NMR (DMSO-d6) δ: 8.96-8.80 (2H, m), 8.68-8.62 (1H, m), 8.51 (1H, br s), 8.43 (1H, d, J=8.59 Hz), 8.19-8.15 (3H, m), 7.94-7.85 (2H, m), 7.78-7.73 (2H, m), 7.70 (2H, d, J=8.39 Hz), 7.57 (1H, t, J=7.73 Hz), 6.93-6.87 (1H, m), 3.84-3.79 (1H, m), 3.28-3.17 (2H, m), 2.67-2.59 (4H, m), 2.27-2.20 (1H, m), 1.90-1.82 (1H, m), 1.09 (3H, d, J=6.30 Hz). LCMS: 534 [M+H].

Example 3 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-morpholin-4-yl-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine Step 1: Synthesis of tert-butyl (1-{4-[(6-morpholin-4-yl-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[(6-morpholin-4-yl-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (CDCl₃) δ: 10.72 (1H, s), 8.32 (1H, d, J=9.6 Hz), 7.55 (2H, d, J=8.3 Hz), 7.42 (2H, d, J=8.3 Hz), 6.13 (1′-1, d, J=9.6 Hz), 5.06 (1H, s), 3.79-3.77 (4H, m), 3.73-3.71 (4H, m), 2.58-2.46 (4H, m), 2.16-2.05 (1H, m), 1.92-1.81 (1H, m), 1.37 (9H, br s). MS m/z 470 (M+H)⁺.

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-morpholin-4-yl-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-morpholin-4-yl-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate was synthesized by the general procedure A.

¹H-NMR (CDCl₃) δ: 7.99 (1H, dd, J=5.2, 1.7 Hz), 7.90 (1H, d, J=8.6 Hz), 7.51 (2H, d, J=8.0 Hz), 7.33-7.31 (2H, m), 7.03-7.01 (1H, m), 6.69 (1H, d, J=9.2 Hz), 6.55-6.51 (2H, m), 6.32 (1H, dd, J=7.7, 4.9 Hz), 5.14 (1H, s), 3.80 (4H, t, J=4.7 Hz), 3.48 (4H, t, J=4.7 Hz), 2.62-2.50 (4H, m), 2.21-2.14 (1H, m), 1.96-1.90 (1H, m), 1.39 (9H, s). MS m/z 542 (M+H)⁺.

Step 3: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-morpholin-4-yl-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine

3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-morpholin-4-yl-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine was synthesized by the general procedure B.

¹H-NMR (CD₃OD) δ: 8.04 (1H, d, J=9.2 Hz), 7.99 (1H, dd, J=6.3, 1.7 Hz), 7.82 (1H, dd, J=7.4, 1.7 Hz), 7.74 (2H, dd, J=6.6, 2.0 Hz), 7.63 (2H, dd, J=6.6, 2.0 Hz), 7.04 (1H, d, J=9.2 Hz), 6.85 (1H, dd, J=7.4, 6.3 Hz), 3.74 (4H, t, J=4.9 Hz), 3.52 (4H, t, J=4.9 Hz), 2.87-2.81 (2H, m), 2.69-2.63 (2H, m), 2.34-2.25 (1H, m), 2.06-1.97 (1H, m). MS m/z 442 (M+H)⁺.

Example 4 Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-phenyl-3H-imidazo[4,5-b]pyridin-5-amine Step 1: Synthesis of tert-butyl (1-{4-[(6-anilino-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[(6-anilino-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl) carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (DMSO-D₆) δ: 10.57 (1H, s), 10.06 (1H, s), 8.25 (1H, d, J=9.4 Hz), 7.64 (1H, s), 7.57 (2H, d, J=7.2 Hz), 7.50 (2H, d, J=7.8 Hz), 7.37 (2H, d, J=8.3 Hz), 7.21 (2H, t, J=7.8 Hz), 7.00 (1H, t, J=7.2 Hz), 6.36 (1H, d, J=9.4 Hz), 2.44-2.36 (3H, m), 2.05-1.96 (1H, m), 1.85-1.76 (1H, m), 1.34 (9H, s), 1.22-1.10 (1H, m). MS m/z 476 (M+H)⁺.

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-anilino-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-anilino-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate was synthesized by the general procedure A.

¹H-NMR (CDCl₃) δ: 7.99 (1H, dd, J=5.2, 1.7 Hz), 7.90 (1H, d, J=8.6 Hz), 7.57 (2H, d, J=8.0 Hz), 7.42-7.40 (2H, m), 7.38-7.36 (2H, m), 7.09-7.07 (1H, m), 7.01-6.98 (1H, m), 6.84 (1H, d, J=8.6 Hz), 6.67 (2H, s), 6.60 (1H, s), 6.32 (1H, dd, J=7.7, 4.9 Hz), 5.19 (1H, s), 2.63-2.39 (4H, m), 2.21-2.13 (1H, m), 2.06-1.88 (3H, m), 1.40 (9H, br s). MS m/z 548 (M+H)⁺.

Step 3: Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-phenyl-3H-imidazo[4,5-b]pyridin-5-amine

3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-phenyl-3H-imidazo[4,5-b]pyridin-5-amine was synthesized by the general procedure B.

¹H-NMR (CD₃OD) δ: 8.03-7.99 (2H, m), 7.87 (1H, dd, J=7.7, 1.4 Hz), 7.81-7.79 (2H, m), 7.72-7.70 (2H, m), 7.65-7.63 (2H, m), 7.21-7.18 (2H, m), 6.98 (1H, d, J=8.6 Hz), 6.93-6.89 (1H, m), 6.87-6.84 (1H, m), 2.89-2.83 (2H, m), 2.74-2.68 (2H, m), 2.36-2.28 (1H, m), 2.08-2.00 (1H, m).

MS m/z 448 (M+H)⁺.

Example 5 Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(4-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine Step 1: Synthesis of tert-butyl {1-[4-({6-[(4-morpholin-4-ylphenyl)amino]-3-nitropyridin-2-yl}amino)phenyl]cyclobutyl}carbamate

tert-Butyl {1-[4-({6-[(4-morpholin-4-ylphenyl)amino]-3-nitropyridin-2-yl}amino)phenyl]cyclobutyl}carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (CDCl₃) δ: 10.71 (1H, s), 8.29 (1H, d, J=9.2 Hz), 7.58 (2H, d, J=8.6 Hz), 7.43-7.39 (2H, 1H), 7.27-7.24 (2H, m), 6.94-6.88 (1H, m), 6.90 (2H, d, J=9.2 Hz), 6.09 (1H, d, J=9.2 Hz), 5.08 (1H, s), 3.88 (4H, t, J=4.8 Hz), 3.18 (4H, t, J=4.8 Hz), 2.58-2.45 (4H, m), 2.14-2.07 (1H, m), 1.90-1.81 (1H, m), 1.44-1.21 (9H, m). MS m/z 561 (M+H)⁺.

Step 2: Synthesis of tert-butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[(4-morpholin-4-ylphenyl)amino]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate

tert-Butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[(4-morpholin-4-ylphenyl)amino]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate was synthesized by using the general procedure A.

¹H-NMR (CDCl₃) δ: 7.98 (1H, d, J=3.4 Hz), 7.84 (1H, d, J=8.6 Hz), 7.56 (2H, d, J=8.6 Hz), 7.35 (2H, d, J=8.6 Hz), 7.28 (2H, d, J=9.2 Hz), 7.05 (1H, br s), 6.88 (2H, d, J=9.2 Hz), 6.72 (1H, d, J=8.6 Hz), 6.66 (1H, br s), 6.42 (1H, s), 6.31 (1H, dd, J=7.7, 4.9 Hz), 3.87 (4H, t, J=4.9 Hz), 3.12 (4H, t, J=4.9 Hz), 2.63-2.50 (4H, m), 2.21-2.13 (1H, m), 1.96-1.88 (1H, m), 1.40 (9H, br s). MS m/z 633 (M+H)⁺.

Step 3: Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(4-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine

3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(4-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine was synthesized by the general procedure B.

¹H-NMR (CD₃OD) δ: 8.08 (1H, d, J=8.6 Hz), 7.98 (1H, dd, J=6.3, 1.1 Hz), 7.94-7.91 (2H, m), 7.88-7.85 (2H, m), 7.80 (1H, dd, J=7.4, 1.7 Hz), 7.72-7.67 (4H, m), 7.00 (1H, d, J=9.2 Hz), 6.84 (1H, dd, J=7.4, 6.3 Hz), 4.14 (4H, t, J=4.6 Hz), 3.75-3.66 (4H, m), 2.93-2.87 (2H, m), 2.77-2.72 (2H, m), 2.37-2.30 (1H, m), 2.10-2.04 (1H, m). MS m/z 533 (M+H)⁺.

Example 6 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-(phenylthio)-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine Step 1: Synthesis of tert-butyl [1-(4-{[3-nitro-6-(phenylthio)pyridin-2-yl]amino}phenyl)cyclobutyl]carbamate

tert-Butyl [1-(4-{[3-nitro-6-(phenylthio)pyridin-2-yl]amino}phenyl)cyclobutyl]carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (CDCl₃) δ: 10.45 (1H, s), 8.29 (1H, d, J=8.6 Hz), 7.62-7.60 (2H, m), 7.57-7.53 (1H, m), 7.50-7.46 (2H, m), 7.30-7.28 (2H, m), 7.23-7.18 (2H, m), 6.50 (1H, d, J=8.6 Hz), 5.01 (1H, s), 2.66-2.47 (4H, m), 2.12-2.06 (1H, m), 1.88-1.81 (1H, m), 1.40 (9H, br s). MS m/z 493 (M+H)⁺.

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-(phenylthio)-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-(phenylthio)-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate was synthesized by using the general procedure A.

MS m/z 565 (M+H)⁺.

Step 3: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-(phenylthio)-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine

3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-(phenylthio)-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine was synthesized by using the general procedure B.

¹H-NMR (CD₃OD) δ: 8.05 (1H, d, J=8.6 Hz), 7.99 (1H, dd, J=6.3, 1.7 Hz), 7.80-7.78 (1H, m), 7.72-7.70 (2H, m), 7.58-7.56 (4H, m), 7.47-7.44 (3H, m), 7.06 (1H, d, J=8.6 Hz), 6.80 (1H, dd, J=7.4, 6.3 Hz), 2.88-2.82 (2H, m), 2.72-2.66 (2H, m), 2.34-2.26 (1H, m), 2.07-2.01 (1H, m).

MS m/z 465 (M+H)⁺.

Example 7 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-phenoxy-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine Step 1: Synthesis of tert-butyl (1-{4-[(3-nitro-6-phenoxypyridin-2-yl)amino]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[(3-nitro-6-phenoxypyridin-2-yl)amino]phenyl}cyclobutyl) carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (CDCl₃) δ: 10.53 (1H, s), 8.55 (1H, d, J=9.2 Hz), 7.48-7.45 (2H, m), 7.36-7.33 (1H, m), 7.21-7.19 (2H, m), 7.17-7.15 (2H, m), 7.13-7.08 (2H, m), 6.45 (1H, d, J=9.2 Hz), 4.98 (1H, s), 2.63-2.41 (4H, m), 2.11-2.04 (1H, m), 1.84-1.77 (1H, m), 1.40 (9H, br s). MS m/z 467 (M+H)⁺.

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-phenoxy-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-phenoxy-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate was synthesized by using the general procedure A.

¹H-NMR (CDCl₃) δ: 8.04-8.01 (2H, m), 7.51-7.47 (2H, m), 7.38-7.34 (2H, m), 7.31-7.29 (2H, m), 7.18-7.12 (4H, m), 7.07-7.05 (1H, m), 6.78 (1H, d, J=8.6 Hz), 6.59-6.56 (1H, m), 6.32 (1H, dd, J=8.0, 5.2 Hz), 5.12 (1H, s), 2.59-2.43 (4H, m), 2.18-2.09 (1H, m), 1.92-1.84 (1H, m), 1.38 (9H, s). MS m/z 549 (M+H)⁺.

Step 3: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-phenoxy-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine

3-{3-[4′-Aminocyclobutyl)phenyl]-5-phenoxy-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine was synthesized by using the general procedure B.

¹H-NMR (CD₃OD) δ: 8.27 (1H, d, J=9.2 Hz), 7.99 (1H, dd, J=6.3, 1.7 Hz), 7.77 (1H, dd, J=7.4, 1.7 Hz), 7.67-7.65 (2H, m), 7.57-7.55 (2H, m), 7.39-7.35 (2H, m), 7.19-7.15 (1H, m), 7.13-7.10 (2H, m), 7.04 (1H, d, J=8.6 Hz), 6.81 (1H, dd, J=7.4, 6.3 Hz), 2.83-2.77 (2H, m), 2.67-2.61 (2H, m), 2.32-2.24 (1H, m), 2.02-1.96 (1H, m). MS m/z 449 (M+H)⁺.

Example 8 Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(3-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine Step 1: Synthesis of tert-butyl {1-[4-({6-[(3-morpholin-4-ylphenyl)amino]-3-nitropyridin-2-yl}amino)phenyl]cyclobutyl}carbamate

tert-Butyl {1-[4-({6-[(3-morpholin-4-ylphenyl)amino]-3-nitropyridin-2-yl}amino) phenyl]cyclobutyl}carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (CDCl₃) δ: 10.68 (1H, s), 8.33 (1H, d, J=9.2 Hz), 7.59 (2H, d, J=8.3 Hz), 7.40 (2H, d, J=8.3 Hz), 7.27-7.23 (3H, m), 7.00 (1H, s), 6.91 (1H, d, J=7.8 Hz), 6.80-6.75 (2H, m), 6.23 (1H, d, J=9.2 Hz), 5.11 (1H, s), 3.83 (4H, t, J=4.8 Hz), 3.12 (4H, t, J=4.8 Hz), 2.71-2.40 (4H, m), 2.15-2.04 (1H, m), 1.91-1.80 (1H, m), 1.39 (9H, s). MS m/z 561 (M+H)⁺.

Step 2: Synthesis of tert-butyl {1-[4-({3-amino-6-[(3-morpholin-4-ylphenyl)amino]pyridin-2-yl}amino)phenyl]cyclobutyl}carbamate

¹H-NMR (CDCl₃) δ: 7.47-7.44 (2H, m), 7.36-7.34 (2H, m), 7.17 (1H, t, J=8.0 Hz), 7.01 (1H, d, J=8.0 Hz), 6.82 (1H, s), 6.78 (1H, d, J=7.4 Hz), 6.71 (1H, s), 6.53 (1H, dd, J=8.3, 2.0 Hz), 6.37 (1H, d, J=8.0 Hz), 6.19 (1H, s), 5.02 (1H, s), 3.82 (4H, t, J=4.9 Hz), 3.11 (4H, t, J=4.9 Hz), 2.95 (2H, s), 2.69-2.48 (4H, m), 2.09-2.01 (1H, m), 1.84-1.77 (1H, m), 1.38 (9H, br s). MS m/z 531 (M+H)⁺.

Step 3: Synthesis of tert-butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[(3-morpholin-4-ylphenyl)amino]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate

¹H-NMR (CDCl₃) δ: 7.98-7.96 (1H, m), 7.90 (1H, d, J=8.6 Hz), 7.56 (2H, d, J=7.4 Hz), 7.37-7.34 (2H, m), 7.18 (1H, t, J=8.0 Hz), 7.03-6.99 (1H, m), 6.96-6.85 (2H, m), 6.74-6.70 (1H, m), 6.61-6.55 (2H, m), 6.32-6.29 (1H, m), 5.36-5.29 (1H, m), 3.84-3.82 (4H, m), 3.09-3.08 (4H, m), 2.64-2.50 (4H, m), 2.21-2.15 (1H, m), 2.09-1.86 (3H, m), 1.41 (9H, br s). MS m/z 633 (M+H)⁺.

Step 4: Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(3-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine

3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(3-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine was synthesized by using the general procedure B.

¹H-NMR (CD₃OD) δ: 8.13-8.09 (2H, m), 7.98 (1H, dd, J=6.3, 1.7 Hz), 7.81-7.80 (2H, m), 7.75-7.72 (4H, m), 7.43 (1H, t, J=8.3 Hz), 7.22 (1H, dd, J=8.0, 2.3 Hz), 7.05 (1H, d, J=9.2 Hz), 6.82 (1H, dd, J=7.4, 6.3 Hz), 4.14-4.12 (4H, m), 3.65-3.63 (4H, m), 2.90-2.84 (2H, m), 2.74-2.67 (2H, m), 2.38-2.29 (1H, m), 2.09-2.00 (1H, m). MS m/z 533 (M+H)⁺.

Example 9 Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(2-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine Step 1: Synthesis of tert-butyl {1-[4-({6-[(2-morpholin-4-ylphenyl)amino]-3-nitropyridin-2-yl}amino)phenyl]cyclobutyl}carbamate

tert-Butyl {1-[4-({6-[(2-morpholin-4-ylphenyl)amino]-3-nitropyridin-2-yl}amino) phenyl]cyclobutyl}carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)-amino]phenyl}cyclobutyl)carbamate as a starting material.

¹H-NMR (CDCl₃) δ: 10.69 (1H, s), 8.35 (1H, d, J=9.2 Hz), 8.23-8.16 (2H, m), 7.60-7.57 (2H, m), 7.47-7.46 (2H, m), 7.17 (1H, dd, J=8.0, 1.7 Hz), 7.08-7.05 (1H, m), 7.03-7.00 (1H, m), 6.19 (1H, d, J=9.2 Hz), 5.10 (1H, s), 3.89-3.88 (4H, m), 2.91-2.89 (4H, m), 2.67-2.49 (4H, m), 2.17-2.08 (1H, m), 1.94-1.85 (1H, m), 1.40 (9H, br s). MS m/z 561 (M+H)⁺.

Step 2: Synthesis of tert-butyl {1-[4-({3-amino-6-[(2-morpholin-4-ylphenyl)amino]pyridin-2-yl}amino)phenyl]cyclobutyl}carbamate

¹H-NMR (CDCl₃) δ: 7.96 (1H, dd, J=8.0, 1.7 Hz), 7.47-7.44 (2H, m), 7.38-7.36 (2H, m), 7.27-7.25 (1H, m), 7.10 (1H, dd, J=7.6, 1.3 Hz), 7.07-7.03 (2H, m), 6.88 (1H, td, J=7.6, 1.3 Hz), 6.71 (1H, s), 6.34 (1H, d, J=8.0 Hz), 5.03 (1H, s), 3.89-3.87 (4H, m), 2.93-2.91 (4H, m), 2.69-2.51 (4H, m), 2.10-2.02 (1H, m), 1.87-1.80 (1H, m), 1.38 (9H, br s). MS m/z 531 (M+H)⁺.

Step 3: Synthesis of tert-butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[(2-morpholin-4-ylphenyl)amino]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate

¹H-NMR (CDCl₃) δ: 8.31 (1H, d, J=6.9 Hz), 8.01-7.98 (1H, m), 7.92 (1H, d, J=8.6 Hz), 7.61-7.57 (2H, m), 7.40 (2H, d, J=8.6 Hz), 7.14-7.10 (2H, m), 6.92 (1H, td, J=7.6, 1.5 Hz), 6.79 (1H, d, J=8.6 Hz), 6.74 (1H, br s), 6.34-6.31 (1H, m), 5.33 (1H, s), 5.21 (1H, s), 3.90-3.89 (4H, m), 2.92-2.90 (4H, m), 2.84-2.44 (4H, m), 2.22-2.15 (1H, m), 2.06-1.83 (1H, m), 1.40 (9H, br s).

MS m/z 633 (M+H)⁺.

Step 4: Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(2-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine

3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(2-morpholin-4-ylphenyl)-3H-imidazo[4,5-b]pyridin-5-amine was synthesized by using the general procedure B.

¹H-NMR (CD₃OD) δ: 8.18 (1H, d, J=9.2 Hz), 8.01 (1H, dd, J=6.3, 1.7 Hz), 7.79-7.73 (4H, m), 7.66-7.60 (3H, m), 7.46-7.42 (1H, m), 7.38-7.35 (1H, m), 7.19 (1H, d, J=9.2 Hz), 6.86-6.83 (1H, m), 3.84-3.82 (4H, m), 3.34 (4H, br s), 2.83-2.77 (2H, m), 2.72-2.66 (3H, m), 2.36-2.27 (1H, m), 2.04-1.97 (1H, m). MS m/z 533 (M+H)⁺.

Example 10 Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(2-morpholin-4-ylethyl)-3H-imidazo[4,5-b]pyridin-5-amine Step 1: Synthesis of tert-butyl {1-[4-({6-[(2-morpholin-4-ylethyl)amino]-3-nitropyridin-2-yl}amino)phenyl]cyclobutyl}carbamate

tert-Butyl {1-[4-([6-[(2-morpholin-4-ylethyl)amino]-3-nitropyridin-2-yl}amino) phenyl]cyclobutyl]carbamate was synthesized by using the general procedure A using tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate as a starting material.

MS m/z 513 (M+H)⁺.

Step 2: Synthesis of tert-butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[(2-morpholin-4-ylethyl)amino]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate

tert-Butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[(2-morpholin-4-ylethyl)amino]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate was synthesized by using the general procedure A.

¹H-NMR (CDCl₃) δ: 7.98-7.97 (1H, m), 7.81 (1H, d, J=8.6 Hz), 7.51 (2H, d, J=8.6 Hz), 7.33-7.31 (2H, m), 6.98 (1H, br s), 6.49 (2H, br s), 6.44 (1H, d, J=8.6 Hz), 6.30 (1H, dd, J=7.7, 4.9 Hz), 5.16-5.14 (1H, m), 5.09-5.04 (1H, m), 3.72-3.70 (4H, m), 3.39-3.35 (2H, m), 2.61-2.40 (10H, m), 2.19-2.12 (1H, m), 1.96-1.88 (1H, m), 1.40 (9H, br s). MS m/z 585 (M+H)⁺.

Step 3: Synthesis of 3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(2-morpholin-4-ylethyl)-3H-imidazo[4,5-b]pyridin-5-amine

3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-N-(2-morpholin-4-ylethyl)-3H-imidazo[4,5-b]pyridin-5-amine was synthesized by using the general procedure B.

¹H-NMR (CD₃OD) δ: 8.02 (1H, dd, J=6.3, 1.7 Hz), 7.97 (1H, d, J=9.2 Hz), 7.87 (1H, dd, J=7.7, 1.4 Hz), 7.80-7.78 (2H, m), 7.70-7.68 (2H, m), 6.88 (1H, dd, J=7.4, 6.3 Hz), 6.82 (1H, d, J=9.2 Hz), 3.89-3.86 (2H, m), 3.80-3.72 (4H, m), 3.53 (2H, d, J=13.2 Hz), 3.37 (2H, t, J=6.0 Hz), 3.12 (2H, td, J=12.3, 3.6 Hz), 2.87-2.81 (2H, m), 2.72-2.67 (2H, m), 2.36-2.27 (1H, m), 2.05-1.98 (1H, m). MS m/z 485 (M+H)⁺.

Example 11 Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-isopropylpiperidine-4-carboxamide Step 1: Synthesis of 1-(3-bromophenyl)-N-isopropylpiperidine-4-carboxamide

1-(3-Bromophenyl)-N-isopropylpiperidine-4-carboxamide was synthesized by the procedure of H (STEP 1), E, and C using 1,3-dibromobenzene and methyl isonipecotate as starting materials.

¹H-NMR (CDCl₃) δ: 7.09 (1H, t, J=8.0 Hz), 7.03 (1H, t, J=2.3 Hz), 6.95-6.93 (1H, m), 6.84 (1H, dd, J=8.6, 1.7 Hz), 5.27 (1H, s), 4.13-4.06 (1H, m), 3.73-3.69 (2H, m), 2.75 (2H, td, J=12.0, 2.9 Hz), 2.20-2.14 (1H, m), 1.94-1.91 (2H, m), 1.88-1.82 (2H, m), 1.16 (6H, d, J=6.3 Hz).

MS m/z 325, 327 (M+H)⁺.

Step 2: Synthesis of N-isopropyl-1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidine-4-carboxamide

N-Isopropyl-1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidine-4-carboxamide was synthesized by the procedure of H (STEP 2).

MS m/z 373 (M+H)⁺.

Step 3: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[4-(isopropylcarbamoyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl) carbamate

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[4-(isopropylcarbamoyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate was synthesized by the procedure G.

¹H-NMR (CDCl₃) δ: 8.11 (1H, d, J=8.0 Hz), 8.06-8.04 (1H, m), 7.78 (1H, d, J=8.0 Hz), 7.63 (1H, s), 7.56 (2H, d, J=8.0 Hz), 7.49 (1H, d, J=8.0 Hz), 7.43 (2H, d, J=8.6 Hz), 7.31 (1H, t, J=8.0 Hz), 7.14 (1H, br s), 6.97-6.95 (1H, 1H), 6.65 (1H, br s), 6.36 (1H, dd, J=7.7, 4.9 Hz), 5.22 (1H, br s), 4.14-4.09 (1H, m), 3.80-3.77 (2H, m), 2.81-2.76 (2H, m), 2.63-2.50 (4H, m), 2.23-2.13 (2H, m), 1.97-1.84 (5H, m), 1.41 (9H, br s), 1.16 (6H, d, J=6.3 Hz). MS m/z 701 (M+H)⁺.

Step 4: Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-isopropylpiperidine-4-carboxamide

1-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-isopropylpiperidine-4-carboxamide was synthesized by the procedure B.

¹H-NMR (CD₃OD) δ: 8.53 (1H, s), 8.39 (1H, d, J=8.6 Hz), 8.26 (1H, d, J=8.0 Hz), 8.17 (1H, d, J=8.0 Hz), 8.04 (1H, dd, J=6.6, 1.4 Hz), 7.87-7.83 (3H, m), 7.78-7.69 (4H, m), 6.86 (1H, dd, J=7A, 6.3 Hz), 4.02-3.97 (1H, m), 3.84-3.78 (4H, m), 2.93-2.87 (2H, m), 2.78-2.68 (3H, m), 2.37-2.15 (5H, m), 2.09-2.03 (1H, m), 1.18 (6H, d, J=6.3 Hz). MS m/z 601 (M+H)⁺.

Example 12 Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)cyclopropanecarboxamide hydrochloride Step 1: Synthesis of N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]cyclopropanecarboxamide

¹H-NMR (400 MHz, CDCl₃) δ: 7.89-7.81 (m, 1H), 7.72-7.68 (m, 1H), 7.56-7.49 (m, 1H), 7.37-7.29 (m, 2H), 1.50-1.41 (m, 1H), 1.33 (s, 12H), 1.11-1.06 (m, 2H), 0.87-0.81 (m, 2H). LCMS: 288 [M+H].

Step 2: Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)cyclopropanecarboxamide hydrochloride

N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)cyclopropanecarboxamide hydrochloride was synthesized by procedures G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 10.47 (s, 1H), 8.96-8.79 (m, 3H), 8.37 (d, 1H, J=8.7 Hz), 8.33-8.06 (m, 3H), 7.94 (d, 1H, J=8.7 Hz), 7.86-7.82 (m, 1H), 7.74 (d, 2H, J=8.7 Hz), 7.71-7.65 (m, 4H), 7.39 (t, 1H, J=7.8 Hz), 6.89-6.81 (m, 1H), 2.72-2.55 (m, 4H), 2.30-2.17 (m, 1H), 1.94-1.79 (m, 2H), 0.85-0.76 (m, 4H). LCMS: 516 [M+H].

Example 13 Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2,2-dimethylpropanamide hydrochloride Step 1: Synthesis of 2,2-dimethyl-N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]propanamide

¹H-NMR (400 MHz, CDCl₃) δ: 8.00-7.96 (m, 1H), 7.62 (d, 1H, J=1.8 Hz), 7.55-7.52 (m, 1H), 7.38-7.31 (m, 2H), 1.34 (s, 12H), 1.30 (s, 9H). LCMS: 304 [M+H].

Step 2: Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2,2-dimethylpropanamide hydrochloride

N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2,2-dimethylpropanamide hydrochloride was synthesized by the procedure of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.38 (s, 1H), 8.95-8.79 (m, 3H), 8.40-8.33 (m, 2H), 8.26-8.05 (m, 2H), 7.95 (d, 1H, J=8.3 Hz), 7.85-7.79 (m, 1H), 7.78-7.64 (m, 6H), 7.39 (t, 1H, J=7.8 Hz), 6.88-6.80 (m, 1H), 2.72-2.56 (m, 4H), 2.30-2.16 (m, 1H), 1.92-1.78 (m, 1H), 1.25 (s, 9H).

LCMS: 532 [M+H].

Example 14 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-propionylpiperazin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine hydrochloride Step 1: Synthesis of 1-propionyl-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperazine

¹H-NMR (400 MHz, CDCl₃) δ: 7.39-7.34 (m, 2H), 7.29 (t, 1H, J=7.8 Hz), 7.05-7.01 (m, 1H), 3.81-3.75 (m, 2H), 3.65-3.58 (m, 2H), 3.23-3.14 (m, 4H), 2.39 (q, 2H, J=7.6 Hz), 1.34 (s, 12H), 1.18 (t, 3H, J=7.6 Hz). LCMS: 345 [M+H].

Step 2: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-propionyl piperazin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine hydrochloride

3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-[3-(4-propionylpiperazin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine hydrochloride was synthesized by the procedure of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.02-8.86 (m, 3H), 8.60-8.33 (m, 2H), 8.17 (dd, 1H, J=6.2, 1.4 Hz), 8.09 (d, 1H, J=8.7 Hz), 7.92 (dd, 1H, J=7.6, 1.4 Hz), 7.78 (d, 2H, J=8.3 Hz), 7.75-7.65 (m, 3H), 7.60-7.54 (m, 1H), 7.36 (t, 1H, J=7.8 Hz), 7.16-7.05 (m, 1H), 6.92 (dd, 1H, J=7.6, 6.2 Hz), 3.71-3.60 (m, 4H), 3.32-3.16 (m, 4H), 2.64 (t, 4H, J=8.0 Hz), 2.39 (q, 2H, J=7.3 Hz), 2.30-2.17 (m, 1H), 1.92-1.78 (m, 1H), 1.02 (t, 3H, J=7.3 Hz). LCMS: 573 [M+H].

Example 15 Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(cyclopropylcarbonyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride Step 1: Synthesis of 1-(cyclopropylcarbonyl)-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperazine

¹H-NMR (400 MHz, CDCl₃) δ: 7.40-7.38 (m, 1H), 7.38-7.34 (m, 1H), 7.30 (t, 1H, J=7.8 Hz), 7.06-7.02 (m, 1H), 3.89-3.75 (m, 4H), 3.30-3.15 (m, 4H), 1.82-1.73 (m, 1H), 1.34 (s, 12H), 1.04-0.99 (m, 2H), 0.82-0.76 (m, 2H). LCMS: 357 [M+H].

Step 2: Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(cyclopropyl carbonyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride

3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(cyclopropylcarbonyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride was synthesized by the procedures of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.02-8.80 (m, 3H), 8.48-8.26 (m, 2H), 8.19-8.13 (m, 1H), 8.09 (d, 1H, J=8.3 Hz), 7.91-7.85 (m, 1H), 7.77 (d, 2H, J=8.3 Hz), 7.72-7.65 (m, 3H), 7.53 (d, 1H, J=7.8 Hz), 7.35 (t, 1H, J=7.8 Hz), 7.10-7.04 (m, 1H), 6.92-6.85 (m, 1H), 3.94-3.79 (m, 2H), 3.71-3.61 (m, 2H), 3.32-3.14 (m, 4H), 2.70-2.56 (m, 4H), 2.30-2.16 (m, 1H), 2.10-2.00 (m, 1H), 1.93-1.77 (m, 1H), 0.80-0.69 (m, 4H). LCMS: 585 [M+H].

Example 16 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-isobutyrylpiperazin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine hydrochloride Step 1: Synthesis of 1-isobutyryl-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperazine

¹H-NMR (400 MHz, CDCl₃) δ: 7.39-7.34 (m, 2H), 7.30 (t, 111, J=7.6 Hz), 7.06-7.02 (m, 1H), 3.82-3.74 (m, 2H), 3.71-3.63 (m, 2H), 3.24-3.15 (m, 4H), 2.89-2.78 (m, 1H), 1.34 (s, 12H), 1.16 (d, 6H, J=6.4 Hz). LCMS: 359 [M+H].

Step 2: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-isobutyryl piperazin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine hydrochloride

3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-[3-(4-isobutyrylpiperazin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine hydrochloride was synthesized by the procedures of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.00-8.85 (m, 3H), 8.52-8.30 (m, 2H), 8.16 (dd, 1H, J=6.0, 1.8 Hz), 8.09 (d, 1H, J=8.7 Hz), 7.90 (dd, 1H, J=7.3, 1.8 Hz), 7.77 (d, 2H, J=8.7 Hz), 7.72-7.66 (m, 3H), 7.56-7.51 (m, 1H), 7.35 (t, 1H, J=7.8 Hz), 7.11-7.04 (m, 1H), 6.90 (dd, 1H, J=7.3, 6.0 Hz), 3.74-3.62 (m, 4H), 3.29-3.14 (m, 4H), 2.98-2.90 (m, 1H), 2.69-2.57 (m, 4H), 2.30-2.17 (m, 1H), 1.90-1.79 (m, 1H), 1.03 (d, 6H, J=6.9 Hz). LCMS: 587 [M+H].

Example 17 Synthesis of 2-[(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)amino]-1,1-dimethyl-2-oxoethyl acetate hydrochloride Step 1: Synthesis of 1,1-dimethyl-2-oxo-2-{[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino}ethyl acetate

To a solution of 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (220 mg) and triethylamine (0.182 mL) in N,N-dimethylacetamide (1.5 mL) chilled to 0° C. was added 2-chloro-1,1-dimethyl-2-oxoethyl acetate (0.175 mL) dropwise. After being stirred at room temperature for 1 h, the reaction mixture was diluted with ethyl acetate and washed with 1 M citric acid aqueous solution 3 times then brine. The organics were dried over anhydrous sodium sulfate and concentrated under reduced pressure. Purification by column chromatography (10-100% ethyl acetate in hexanes) gave the product (290 mg, 83%).

¹H-NMR (400 MHz, CDCl₃) δ: 8.00-7.96 (m, 1H), 7.85 (br s, 1H), 7.63-7.61 (m, 1H), 7.59-7.55 (m, 1H), 7.37 (t, 1H, J=7.8 Hz), 2.16 (s, 3H), 1.73 (s, 6H), 1.35 (s, 12H). LCMS: 348 [M+H].

Step 2: Synthesis of 2-[(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)amino]-1,1-dimethyl-2-oxoethyl acetate hydrochloride

2-[(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)amino]-1,1-dimethyl-2-oxoethyl acetate hydrochloride was synthesized by the procedures of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.70 (s, 1H), 8.94-8.78 (m, 3H), 8.38 (d, 1H, J=8.3 Hz), 8.36-8.31 (m, 1H), 8.26-7.99 (m, 2H), 7.94 (d, 1H, J=8.3 Hz), 7.85-7.78 (m, 1H), 7.78-7.64 (m, 6H), 7.40 (t, 1H, J=8.0 Hz), 6.87-6.79 (m, 1H), 2.71-2.55 (m, 4H), 2.29-2.16 (m, 1H), 2.08 (s, 3H), 1.93-1.80 (m, 1H), 1.58 (s, 6H). LCMS: 576 [M+H].

Example 18 Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2-hydroxy-2-methylpropanamide hydrochloride Step 1: Synthesis of 2-({3-[2-(2-aminopyridin-3-yl)-3-(4-{1-[(tert-butoxycarbonyl)amino]cyclobutyl}phenyl)-3H-imidazo[4,5-b]pyridin-5-yl]phenyl}amino)-1,1-dimethyl-2-oxoethyl acetate

To a suspension of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50 mg) and 1,1-dimethyl-2-oxo-2-{[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino}ethyl acetate (71 mg) and potassium phosphate (65 mg) and PdCl₂(dppf)CH₂Cl₂ (8 mg) in dioxane (2 mL) and H₂O (0.2 mL) was degassed for 5 minutes and then heated to 80° C. for 18 h. The reaction mixture was concentrated under reduced pressure. Purification by column chromatography (2 times: 0-10% methanol in chloroform then 0-10% methanol in ethyl acetate) gave the product (44 mg, 64%).

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.65 (br s, 1H), 8.28 (d, 1H, J=8.7 Hz), 8.22 (br s, 1H), 7.99 (dd, 1H, J=4.6, 1.8 Hz), 7.87 (d, 1H, J=8.7 Hz), 7.75-7.62 (m, 3H), 7.53 (d, 2H, J=8.3 Hz), 7.48-7.42 (m, 2H), 7.37 (t, 1H, J=7.8 Hz), 7.18-7.09 (m, 1H), 7.03 (br s, 2H), 6.32 (dd, 1H, J=7.8, 5.0 Hz), 2.48-2.35 (m, 4H), 2.12-1.97 (m, 4H), 1.89-1.76 (m, 1H), 1.57 (s, 6H), 1.42-1.08 (m, 9H); LCMS: 676 [M+H].

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2-hydroxy-2-methylpropanoyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

To a solution of 2-({3-[2-(2-aminopyridin-3-yl)-3-(4-{1-[(tert-butoxycarbonyl)amino]cyclobutyl}phenyl)-3H-imidazo[4,5-b]pyridin-5-yl]phenyl}amino)-1,1-dimethyl-2-oxoethyl acetate (24 mg) in methanol (6 mL) was added MP-carbonate (Argonaout technologies 2.91 mmol/g, 200 mg) at room temperature. After being stirred at 40° C. for 4 h, the reaction mixture was filtered and concentrated under reduced pressure. Purification by column chromatography (0-10% methanol in chloroform) gave the product (20 mg, 91%).

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.65 (br s, 1H), 8.43-8.38 (m, 1H), 8.28 (d, 1H, J=8.7 Hz), 7.99 (dd, 1H, J=5.0, 1.8 Hz), 7.90 (d, 1H, J=8.7 Hz), 7.81-7.75 (m, 1H), 7.74-7.64 (m, 2H), 7.53 (d, 2H, J=8.7 Hz), 7.48-7.41 (m, 2H), 7.36 (t, 1H, J=8.0 Hz), 7.16-7.09 (m, 1H), 7.05 (br s, 2H), 6.32 (dd, 1H, J=7.6, 5.0 Hz), 5.76 (s, 1H), 2.48-2.37 (m, 4H), 2.09-1.96 (m, 1H), 1.89-1.76 (m, 1H), 1.40-1.10 (m, 15H); LCMS: 634 [M+H].

Step 3: Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2-hydroxy-2-methylpropanamide hydrochloride

To a solution of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2-hydroxy-2-methylpropanoyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (20 mg) in dichloromethane (3 mL) was added trifluoroacetic acid (0.6 mL) dropwise at room temperature. After being stirred at the same temperature for 1 h, the reaction mixture was concentrated under reduced pressure. Dichloromethane (5 mL) and MP-carbonate (Argonaout technologies 2.91 mmol/g, 200 mg) were added. The mixture was stayed for 30 min. with occasional shaking then filtered. The filtrate was concentrated under reduced pressure. To a solution of the residue in dichloromethane (5 mL) and methanol (0.5 mL) was added hydrogen chloride in ethyl acetate (4 M, 0.04 mL) at room temperature. After being stirred for 10 min., the mixture was concentrated under reduced pressure. The resulting solid was suspended with ethyl acetate and filtered to give the product (15 mg).

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.71 (s, 1H), 8.93-8.79 (m, 3H), 8.49-8.45 (m, 1H), 8.37 (d, 1H, J=8.3 Hz), 8.30-8.04 (m, 2H), 7.97 (d, 1H, J=8.3 Hz), 7.86-7.65 (m, 7H), 7.40 (t, 1H, J=8.0 Hz), 6.87-6.81 (m, 1H), 2.71-2.56 (m, 4H), 2.29-2.17 (m, 1H), 1.92-1.79 (m, 1H), 1.37 (s, 6H). LCMS: 534 [M+H].

Example 19 Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(2,2-dimethylpropanoyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride Step 1: Synthesis of 1-(2,2-dimethylpropanoyl)-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperazine

¹H-NMR (400 MHz, CDCl₃) δ: 7.39-7.33 (m, 2H), 7.29 (t, 1H, J=7.8 Hz), 7.05-7.01 (m, 1H), 3.83-3.77 (m, 4H), 3.22-3.16 (m, 4H), 1.34 (s, 12H), 1.31 (s, 9H). LCMS: 373 [M+H].

Step 2: Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(2,2-dimethylpropanoyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride

3-(3-[4-(1-Aminocyclobutyl)phenyl]-5-{3-[4-(2,2-dimethylpropanoyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride was synthesized by the procedure F and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 8.98-8.86 (m, 3H), 8.43-8.28 (m, 2H), 8.16 (dd, 1H, J=6.2, 1.6 Hz), 8.08 (d, 1H, J=8.7 Hz), 7.90-7.85 (m, 1H), 7.77 (d, 2H, J=8.7 Hz), 7.72-7.65 (m, 3H), 7.56-7.51 (m, 1H), 7.35 (t, 1H, J=8.0 Hz), 7.09-7.03 (m, 1H), 6.91-6.85 (m, 1H), 3.78-3.70 (m, 4H), 3.24-3.18 (m, 4H), 2.68-2.59 (m, 4H), 2.30-2.17 (m, 1H), 1.90-1.79 (m, 1H), 1.24 (s, 9H).

LCMS: 601 [M+H].

Example 20 Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-1,4-dioxane-2-carboxamide hydrochloride Step 1: Synthesis of N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-1,4-dioxane-2-carboxamide

To a solution of 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (220 mg) and triethylamine (0.182 mL) in N,N-dimethylacetamide (1.5 mL) chilled to 0° C. was added 1,4-dioxane-2-carbonyl chloride (prepared from 1,4-dioxane-2-carboxylic acid (159 mg) and oxalyl chloride (0.15 mL) in dichloromethane (2.5 mL)) dropwise. After being stirred at room temperature for 1 h, the reaction mixture was diluted with ethyl acetate and washed with 1 M citric acid aqueous solution (3 times) then brine. The organics were dried over anhydrous sodium sulfate and concentrated under reduced pressure. Purification by column chromatography (10-100% ethyl acetate in hexanes) gave the product (270 mg, 81%).

¹H-NMR (400 MHz, CDCl₃) δ: 8.30 (br s, 1H), 8.00-7.96 (m, 1H), 7.68-7.66 (m, 1H), 7.58-7.54 (m, 1H), 7.36 (t, 1H, J=7.8 Hz), 4.26-4.21 (m, 2H), 3.96-3.76 (m, 3H), 3.63 (ddd, 1H, J=11.3, 11.3, 3.1 Hz), 3.51 (dd, 1H, J=12.2, 10.8 Hz), 1.34 (s, 12H). LCMS: 334 [M+H].

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(1,4-dioxan-2-ylcarbonyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

To a suspension of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50 mg) and N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-1,4-dioxane-2-carboxamide (68 mg) and potassium phosphate (65 mg) and PdCl₂(dppf)CH₂Cl₂ (8 mg) in dioxane (2 mL) and H₂O (0.2 mL) was degassed for 5 minutes and then heated to 80° C. for 18 h. The reaction mixture was concentrated under reduced pressure. Purification by column chromatography (2 times: 0-10% methanol in chloroform then 0-10% methanol in ethyl acetate) gave the product (44 mg, 66%).

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.86 (br s, 1H), 8.33-8.26 (m, 2H), 7.99 (dd, 1H, J=5.0, 1.8 Hz), 7.87 (d, 1H, J=8.7 Hz), 7.77-7.63 (m, 3H), 7.53 (d, 2H, J=8.3 Hz), 7.47-7.41 (m, 2H), 7.38 (t, 1H, J=7.8 Hz), 7.22-7.09 (m, 1H), 7.03 (br s, 2H), 6.32 (dd, 1H, J=7.8, 5.0 Hz), 4.24 (dd, 1H, J=9.2, 3.2 Hz), 3.98-3.87 (m, 2H), 3.78-3.69 (m, 2H), 3.61-3.52 (m, 2H), 2.48-2.35 (m, 4H), 2.10-1.95 (m, 1H), 1.90-1.74 (m, 1H), 1.41-1.06 (m, 9H); LCMS: 662 [M+H].

Step 3: Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-1,4-dioxane-2-carboxamide hydrochloride

To a solution of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(1,4-dioxan-2-ylcarbonyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (38 mg) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL) dropwise at room temperature. After being stirred at the same temperature for 1 h, the reaction mixture was concentrated under reduced pressure. Dichloromethane (5 mL) and MP-carbonate (Argonaout technologies 2.91 mmol/g, 400 mg) were added. The mixture was stayed for 30 min. with occasional shaking then filtered. The filtrate was concentrated under reduced pressure. To a solution of the residue in dichloromethane (5 mL) and methanol (0.4 mL) was added hydrogen chloride in ethyl acetate (4 M, 0.072 mL) at room temperature. After being stirred for 10 min., the mixture was concentrated under reduced pressure. The resulting solid was suspended with ethyl acetate and filtered to give the product (24 mg).

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.91 (s, 1H), 8.90-8.74 (m, 3H), 8.42-8.33 (m, 2H), 8.17-7.90 (m, 3H), 7.80-7.64 (m, 7H), 7.41 (t, 1H, J=8.0 Hz), 6.83-6.76 (m, 1H), 4.26 (dd, 1H, J=9.4, 3.0 Hz), 3.99-3.87 (m, 2H), 3.78-3.69 (m, 2H), 3.61-3.53 (m, 2H), 2.72-2.55 (m, 4H), 2.29-2.15 (m, 1H), 1.93-1.80 (m, 1H); LCMS: 562 [M+H].

Example 21 Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imdazo[4,5-b]pyridin-5-yl}phenyl)tetrahydro-2H-pyran-4-carboxamide hydrochloride Step 1: Synthesis of N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydro-2H-pyran-4-carboxamide

To a solution of 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (220 mg) and triethylamine (0.182 mL) in N,N-dimethylacetamide (1.5 mL) chilled to 0° C. was added tetrahydro-2H-pyran-4-carbonyl chloride (prepared from tetrahydro-2H-pyran-4-carboxylic acid (156 mg) and oxalyl chloride (0.15 mL) in dichloromethane (2.5 mL)) dropwise. After being stirred at room temperature for 1 h, the reaction mixture was diluted with ethyl acetate and washed with 1 M citric acid aqueous solution (3 times) then brine. The organics were dried over anhydrous sodium sulfate and concentrated under reduced pressure. Purification by column chromatography (10-100% ethyl acetate in hexanes) gave the product (267 mg, 81%).

¹H-NMR (400 MHz, CDCl₃) δ: 7.92-7.87 (m, 1H), 7.68-7.66 (m, 1H), 7.57-7.53 (m, 1H), 7.35 (t, 1H, J=7.6 Hz), 7.14 (br s, 1H), 4.10-4.03 (m, 2H), 3.46 (ddd, 2H, J=11.5, 11.5, 2.8 Hz), 2.51-2.42 (m, 1H), 1.97-1.80 (m, 4H), 1.34 (s, 12H); LCMS: 332 [M+H].

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(tetrahydro-2H-pyran-4-ylcarbonyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl) carbamate

To a suspension of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50 mg) and N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydro-2H-pyran-4-carboxamide (67 mg) and potassium phosphate (65 mg) and PdCl₂(dppf)CH₂Cl₂ (8 mg) in dioxane (2 mL) and H₂O (0.2 mL) was degassed for 5 minutes and then heated to 80° C. for 18 h. The reaction mixture was concentrated under reduced pressure. Purification by column chromatography (2 times: 0-10% methanol in chloroform then 0-10% methanol in ethyl acetate) gave the product (34 mg, 51%).

¹H-NMR (400 MHz, DMSO-d₆) δ: 10.03 (br s, 1H), 8.30-8.16 (m, 2H), 7.99 (dd, 1H, J=4.6, 1.8 Hz), 7.85 (d, 1H, J=8.3 Hz), 7.74-7.60 (m, 3H), 7.53 (d, 2H, J=8.7 Hz), 7.48-7.41 (m, 2H), 7.36 (t, 1H, J=7.8 Hz), 7.22-7.07 (m, 1H), 7.02 (br s, 2H), 6.32 (dd, 1H, J=7.8, 4.6 Hz), 3.95-3.87 (m, 2H), 3.40-3.29 (m, 2H), 2.65-2.56 (m, 1H), 2.48-2.37 (m, 4H), 2.08-1.98 (m, 1H), 1.90-1.78 (m, 1H), 1.75-1.61 (m, 4H), 1.42-1.09 (m, 9H); LCMS: 660 [M+H].

Step 3: Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)tetrahydro-2H-pyran-4-carboxamide hydrochloride

To a solution of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(tetrahydro-2H-pyran-4-ylcarbonyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (29 mg) in dichloromethane (4 mL) was added trifluoroacetic acid (1 mL) dropwise at room temperature. After being stirred at the same temperature for 1 h, the reaction mixture was concentrated under reduced pressure. Dichloromethane (5 mL) and MP-carbonate (Argonaout technologies 2.91 mmol/g, 400 mg) were added. The mixture was stayed for 30 min. with occasional shaking then filtered. The filtrate was concentrated under reduced pressure. To a solution of the residue in dichloromethane (5 mL) and methanol (0.4 mL) was added hydrogen chloride in ethyl acetate (4 M, 0.055 mL) at room temperature. After being stirred for 10 min., the mixture was concentrated under reduced pressure. The resulting solid was suspended with ethyl acetate and filtered to give the product (19 mg).

¹H-NMR (400 MHz, DMSO-d₆) δ: 10.14 (s, 1H), 8.94-8.80 (m, 3H), 8.40-8.10 (m, 4H), 7.94 (d, 1H, J=8.3 Hz), 7.87-7.81 (m, 1H), 7.75 (d, 2H, J=8.7 Hz), 7.72-7.64 (m, 4H), 7.40 (t, 1H, J=8.0 Hz), 6.88-6.82 (m, 1H), 3.96-3.87 (m, 2H), 3.40-3.32 (m, 2H), 2.73-2.56 (m, 5H), 2.30-2.17 (m, 1H), 1.93-1.80 (m, 1H), 1.76-1.61 (m, 4H); LCMS: 560 [M+H].

Example 22 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-tert-butylbenzamide hydrochloride Step 1: Synthesis of N-tert-butyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzamide

N-tert-butyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzamide was synthesized by the procedure of H (Step 3).

¹H-NMR (400 MHz, CDCl₃) δ: 8.03-8.00 (m, 1H), 7.94-7.88 (m, 2H), 7.44 (t, 1H, J=7.3 Hz), 6.00 (br s, 1H), 1.48 (s, 9H), 1.36 (s, 12H). LCMS: 304 [M+H].

Step 2: Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-tert-butylbenzamide hydrochloride

3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}-N-tert-butylbenzamide hydrochloride was synthesized by the procedures of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 8.94-8.84 (m, 3H), 8.43-8.09 (m, 7H), 7.95 (s, 1H), 7.87-7.79 (m, 2H), 7.76 (d, 2H, J=8.7 Hz), 7.70 (d, 2H, J=8.7 Hz), 7.54 (t, 1H, J=7.8 Hz), 6.88-6.82 (m, 1H), 2.70-2.56 (m, 4H), 2.30-2.17 (m, 1H), 1.90-1.79 (m, 1H), 1.41 (s, 9H). LCMS: 532 [M+H].

Example 23 Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2-methoxy-2-methylpropanamide hydrochloride Step 1: Synthesis of 2-methoxy-2-methyl-N-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]propanamide

¹H-NMR (400 MHz, CDCl₃) δ: 8.56 (br s, 1H), 8.02-7.98 (m, 1H), 7.72-7.69 (m, 1H), 7.56-7.52 (m, 1H), 7.36 (t, 1H, J=7.8 Hz), 3.35 (s, 3H), 1.45 (s, 6H), 1.34 (s, 12H). LCMS: 373 [M+H].

Step 2: Synthesis of N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2-methoxy-2-methylpropanamide hydrochloride

N-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-2-methoxy-2-methylpropanamide hydrochloride was synthesized by the procedures of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.77 (s, 1H), 8.98-8.79 (m, 3H), 8.46 (s, 1H), 8.38 (d, 1H, J=8.7 Hz), 8.33-8.11 (m, 2H), 7.96 (d, 1H, J=8.7 Hz), 7.89-7.82 (m, 1H), 7.80-7.66 (m, 6H), 7.40 (t, 1H, J=8.0 Hz), 6.90-6.83 (m, 1H), 3.25 (s, 3H), 2.71-2.56 (m, 4H), 2.30-2.16 (m, 1H), 1.92-1.79 (m, 1H), 1.39 (s, 6H). LCMS: 548 [M+H].

Example 24 Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide Step 1: Synthesis of ethyl 1-(3-bromophenyl)piperidine-4-carboxylate

To a solution of 1,3-dibromobenzene (10 g, 42 mmol) in toluene (424 mL), were added ethyl isonipecotate (6.5 mL, 42 mmol), rac-BINAP (2.0 g, 3.2 mmol), NaOtBu (4.9 g, 51 mmol) and Pd2(dba)₃ (0.97 g, 1.1 mmol). The mixture was heated at 80° C. for 4 h and diluted with water and ethyl acetate and separated. The organic phase was dried over unhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified with silica gel column chromatography (hexane/ethyl acetate 10:0 to 9:1) to give the titled compound (5.6 g, 42%).

¹H-NMR (CDCl₃) δ: 7.09 (1H, t, J=8.0 Hz), 7.04 (1H, t, J=2.3 Hz), 6.94-6.92 (1H, m), 6.83 (1H, dd, J=8.3, 2.0 Hz), 4.16 (2H, q, J=7.1 Hz), 3.63 (2H, dt, J=12.8, 3.4 Hz), 2.81 (2H, td, J=12.0, 2.5 Hz), 2.44 (1H, tt, J=11.2, 4.0 Hz), 2.01 (2H, dd, J=13.5, 3.2 Hz), 1.84 (2H, ddd, J=24.8, 11.3, 3.9 Hz), 1.27 (3H, t, J=7.2 Hz); LC/MS: 312 [M+H].

Step 2: Synthesis of 1-(3-bromophenyl)piperidine-4-carboxylic acid

To a solution of ethyl 1-(3-bromophenyl)piperidine-4-carboxylate (5.6 g, 18 mmol) in THF/MeOH (360 mL, 1:1), was added a solution of NaOH (1M, 90 mL) at rt. The mixture was heated at 50° C. for 30 min and organic solvent was removed under reduced pressure. The water solution was mixed with ice and 1M HCl (90 mL) and extracted with dichloromethane/methanol. The combined organic phase was dried over unhydrous Na2SO4 and evaporated. The residue was solidified with dichloromethane/hexane to give the titled compound (4.4 g, 85%) as a white solid.

¹H-NMR (DMSO-D₆) δ: 12.23 (1H, s), 7.13 (1H, t, J=8.0 Hz), 7.06 (1H, t, J=2.3 Hz), 6.93 (1H, dd, J=8.3, 2.0 Hz), 6.88 (1H, dd, J=7.2, 1.4 Hz), 3.65 (2H, dt, J=12.6, 3.4 Hz), 3.33 (1H, s), 2.79 (2H, td, J=12.2, 2.3 Hz), 1.87 (2H, dd, J=13.2, 2.9 Hz), 1.60 (2H, ddd, J=24.6, 11.5, 4.0 Hz).

Step 3: Synthesis of 1-(3-bromophenyl)-N,N-dimethylpiperidine-4-carboxamide

To a solution of 1-(3-bromophenyl)piperidine-4-carboxylic acid (2 g, 7.0 mmol) in dioxane (70 mL), was added thionyl chloride (2.6 mL, 35 mmol) at 0° C. The mixture was kept at rt for 1 h and evaporated. The residue was co-evaporated with dichloromethane and dissolved in dichloromethane (5 mL). To this mixture, were added the mixture of dimethylamine HCl salt (1.7 g, 21 mmol), triethylamine (4.9 mL, 35 mmol) and dichloromethane (20 mL) at 0° C. The mixture was stirred at rt for 1 h and diluted with water and separated. The organic phase was dried and evaporated. The residue was purified with silica gel column chromatography (hexane/ethyl acetate 10:0 to 1:9) to give the titled compound (2.2 g, 100%).

¹H-NMR (CDCl₃) δ: 7.08 (1H, td, J=8.2, 3.1 Hz), 7.03 (1H, s), 6.93 (1H, d, J=8.0 Hz), 6.84 (1H, d, J=8.0 Hz), 3.72 (2H, d, J=10.3 Hz), 3.08 (3H, d, J=2.9 Hz), 2.96 (3H, d, J=2.3 Hz), 2.76 (2H, t, J=12.3 Hz), 2.64 (1H, dq, J=14.9, 3.8 Hz), 1.94 (2H, q, J=12.4 Hz), 1.81 (2H, d, J=13.2 Hz); LC/MS: 311 [M+H].

Step 4: Synthesis of N,N-dimethyl-1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidine-4-carboxamide

To a solution of 1-(3-bromophenyl)-N,N-dimethylpiperidine-4-carboxamide (2.2 g, 7.3 mmol) were added bis(pinacolato)diboron (2.8 g, 11 mmol), PdCl2(dppf) (237 mg, 0.29 mmol), and KOAc (2.2 g, 22 mmol). The mixture was heated at 80° C. for 6 h and diluted with water and ethyl acetate then separated. The organic phase was dried and evaporated. The residue was purified with silica gel column chromatography (hexane/ethyl acetate 10:0 to 0:10) to give the titled compound (1.94 g, 75%).

¹H-NMR (CDCl₃) δ: 7.39 (1H, d, J=2.3 Hz), 7.30 (1H, d, J=6.9 Hz), 7.27 (1H, t, J=7.4 Hz), 7.06-7.04 (1H, m), 3.78 (2H, d, J=12.0 Hz), 3.09 (3H, s), 2.97 (3H, s), 2.74 (2H, td, J=12.2, 2.7 Hz), 2.61 (1H, tt, J=11.5, 3.4 Hz), 1.97 (2H, ddd, J=24.8, 12.5, 3.9 Hz), 1.83 (2H, d, J=13.2 Hz), 1.34 (12H, s).

Step 5a: Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide HCl salt

To a solution of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (400 mg, 0.81 mmol) in DMF (8.1 mL)/water (0.45 mL), were added N,N-dimethyl-1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidine-4-carboxamide. (584 mg, 1.6 mmol), AMPHOS (58 mg, 0.08 mmol) and Na₂CO₃ (95 mg, 0.9 mmol). The mixture was heated at 160° C. for 1 h in microwave oven. The mixture was evaporated under reduced pressure and the residue was purified with silica gel column chromatography (hexane/ethyl acetate/methanol, 10:0:0 to 0:10:1) to give tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[4-(dimethylcarbamoyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. This compound was deprotected with methanol (15 mL) and 4M HCl in ethyl acetate (15 mL) for 18 h at rt. The mixture was solidified with diethyl ether and the solid was purified with HPLC and HCl was added to the fraction and evaporated then solidified with diethyl ether to give the titled compound (281 mg, 50%) as a white solid.

¹H-NMR (DMSO-D₆) δ: 8.94 (3H, s), 8.52-8.39 (1H, m), 8.43 (1H, d, J=8.6 Hz), 8.18 (1H, dd, J=6.3, 1.7 Hz), 8.13 (1H, d, J=8.6 Hz), 7.94 (1H, dd, J=7.4, 1.7 Hz), 7.77 (2H, d, J=8.0 Hz), 7.70 (2H, d, J=8.6 Hz), 6.93 (1H, dd, J=7.4, 6.3 Hz), 3.74-3.64 (2H, m), 3.09 (4H, s), 2.85 (3H, s), 2.69-2.58 (4H, m), 2.28-2.19 (1H, m), 1.95-1.81 (3H, m); LCMS: 587 [M+H].

Alternative Synthesis Method Step 1: Synthesis of tert-butyl (1-{4-[(6-{3-[4-(dimethylcarbamoyl)piperidin-1-yl]phenyl}-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate

To a solution of tert-butyl (1-{4-[(6-chloro-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate (4.1 g, 9.8 mmol) in toluene/EtOH/saturated NaHCO3 (200/200/20 mL), were added N,N-dimethyl-1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidine-4-carboxamide. (4.2 g, 12 mmol), Pd(PPh4)₃ (563 mg, 0.49 mmol). The mixture was heated at 100° C. for 18 h. The mixture was filtered through celite, separated and evaporated. The residue was purified with silica gel column chromatography (hexane/ethyl acetate/methanol, 85:15:1.5) to give the titled compound as a pale red solid (5.4 g, 91%)

¹H-NMR (CDCl₃) δ: 10.31 (1H, s), 8.56 (1H, d, J=9.2 Hz), 7.77 (3H, d, J=8.0 Hz), 7.67 (1H, dd, J=12.0, 8.0 Hz), 7.55 (1H, t, J=7.4 Hz), 7.47 (5H, d, J=6.9 Hz), 7.36 (1H, t, J=8.0 Hz), 7.30 (1H, d, J=9.2 Hz), 7.08 (1H, d, J=8.0 Hz), 5.21 (1H, s), 3.85 (2H, d, J=12.6 Hz), 3.11 (3H, s), 2.98 (3H, s), 2.86 (2H, t, J=11.2 Hz), 2.75-2.66 (1H, m), 2.58-2.51 (3H, m), 2.14-1.95 (3H, m), 1.90-1.79 (3H, m), 1.46-1.20 (9H, br m).

Step 2: Synthesis of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[4-(dimethylcarbamoyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

To a solution of tert-butyl (1-{4-[(6-{3-[4-(dimethylcarbamoyl)piperidin-1-yl]phenyl}-3-nitropyridin-2-yl)amino]phenyl}cyclobutyl)carbamate (5.4 g, 8.9 mmol) in THF/MeOH (150 mL, 1:1), was added Pd on carbone (5% wet, 1 g). The mixture was stirred under hydrogen gas (1 atm) for 2 h. The mixture was filtered through celite and evaporated. The residue was dissolved in acetic acid (30 mL) and 2-aminonicotinaldehyde (1.1 g, 9.3 mmol) was added then the mixture was stirred at rt for 1 h. The mixture was heated at 80° C. for 1 h and the mixture was poured into water and neutralized with sodium hydroxide (20 g). The solid was collected by filtration and purified with silica gel column chromatography (hexane/ethyl acetate/methanol, 10:0:0 to 0:10:1) to give a pale orange solid. The solid was slurried in diethyl ether (200 mL) and collected to give the titled compound as a pale yellow solid (3.4 g, 62%).

Step 3: Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide HCl salt

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[4-(dimethylcarbamoyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (3.4 g, 4.9 mmol) was deprotected with methanol (15 mL) and 4M HCl in ethyl acetate (15 mL) for 18 h at rt. The mixture was solidified with ethyl acetate and collected with filtration to give the titled compound (2.9 g, 100%) as a white solid.

Example 25 Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-diethylpiperidine-4-carboxamide

1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-diethylpiperidine-4-carboxamide was synthsized by the procedure used in the synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide.

¹H-NMR (DMSO-D₆) δ: 8.89 (3H, s), 8.40 (2H, d, J=8.0 Hz), 8.16 (1H, dd, J=6.3, 1.7 Hz), 8.11 (1H, d, J=8.6 Hz), 7.91 (1H, d, J=8.0 Hz), 7.76 (2H, d, J=8.6 Hz), 7.69 (2H, d, J=8.6 Hz), 6.90 (1H, t, J=6.6 Hz), 3.77-3.68 (1H, m), 3.39 (2H, q, J=7.4 Hz), 3.28 (2H, q, J=7.1 Hz), 2.69-2.57 (4H, m), 2.51-2.49 (2H, m), 2.27-2.18 (1H, m), 1.89-1.74 (3H, m), 1.17 (3H, t, J=6.9 Hz), 1.02 (3H, t, J=7.2 Hz); LCMS: 615 [M+H].

Example 26 Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(morpholin-4-ylcarbonyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine

3-(3-[4-(1-Aminocyclobutyl)phenyl]-5-{3-[4-(morpholin-4-ylcarbonyl)piperidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine was synthesized by the procedure used in the synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide.

¹H-NMR (DMSO-D₆) δ: 8.91 (3H, s), 8.41 (2H, d, J=8.0 Hz), 8.17 (1H, dd, J=6.3, 1.7 Hz), 8.11 (1H, d, J=8.0 Hz), 7.92 (1H, d, J=6.3 Hz), 7.77 (2H, d, J=8.6 Hz), 7.69 (2H, d, J=8.6 Hz), 7.64-7.40 (1H, m), 6.91 (1H, dd, J=7.4, 6.3 Hz), 3.75-3.69 (1H, m), 3.62-3.60 (4H, m), 3.49-3.47 (4H, m), 3.10-2.95 (1H, m), 2.69-2.58 (4H, m), 2.28-2.19 (1H, m), 1.92-1.80 (3H, m); LCMS: 629 [M+H].

Example 27 Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-(2-methoxyethyl)piperidine-4-carboxamide

1-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-(2-methoxyethyl)piperidine-4-carboxamide was synthsized by the procedure used in the synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide.

¹H-NMR (CD₃OD) δ: 8.24 (1H, s), 8.18 (1H, d, J=8.6 Hz), 7.99 (1H, dd, J=5.2, 1.7 Hz), 7.91 (1H, d, J=8.6 Hz), 7.69 (2H, d, J=9.2 Hz), 7.64 (2H, s), 7.63 (2H, d, J=8.6 Hz), 7.46 (1H, d, J=7.4 Hz), 7.38 (1H, dd, J=7.7, 2.0 Hz), 7.29 (1H, t, J=8.0 Hz), 7.02 (1H, dd, J=8.6, 2.3 Hz), 6.50 (1H, dd, J=7.4, 5.2 Hz), 3.78 (2H, d, J=12.6 Hz), 3.46 (2H, t, J=5.7 Hz), 3.35 (3H, s), 2.88-2.75 (4H, m), 2.68-2.62 (4H, m), 2.42-2.34 (1H, m), 2.32-2.23 (1H, m), 2.06-1.97 (1H, m); LCMS: 617 [M+H].

Example 28 Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-ethylpiperidine-4-carboxamide

1-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-ethylpiperidine-4-carboxamide was synthsized by the procedure used in the synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide.

¹H-NMR (CD₃OD) δ: 8.25 (1H, d, J=8.0 Hz), 8.07 (1H, s), 8.00 (1H, dd, J=5.7, 1.7 Hz), 7.96 (1H, d, J=8.6 Hz), 7.74 (2H, d, J=8.6 Hz), 7.71 (1H, s), 7.67 (2H, d, J=8.6 Hz), 7.60 (1H, dd, J=7.4, 1.7 Hz), 7.55 (1H, d, J=8.0 Hz), 7.33 (1H, t, J=8.0 Hz), 7.10 (1H, dd, J=8.0, 2.3 Hz), 6.66 (1H, dd, J=7.4, 5.7 Hz), 3.79 (2H, d, J=12.6 Hz), 3.21 (2H, q, J=7.4 Hz), 2.92-2.82 (4H, m), 2.70-2.61 (4H, m), 2.41-2.33 (1H, m), 2.33-2.25 (1H, m), 2.08-1.99 (1H, m), 1.13 (3H, t, J=7.4 Hz); LCMS: 587 [M+H].

Example 29 Synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-methylpiperidine-4-carboxamide

1-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N-methylpiperidine-4-carboxamide was synthsized by the procedure used in the synthesis of 1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpiperidine-4-carboxamide.

¹H-NMR (DMSO-D₆) δ: 8.94 (2H, s), 8.42 (1H, d, J=8.0 Hz), 8.18 (1H, dd, J=6.3, 1.7 Hz), 8.13 (1H, d, J=8.6 Hz), 7.93 (2H, dd, J=8.0, 1.7 Hz), 7.78 (2H, d, J=8.6 Hz), 7.70 (2H, d, J=8.6 Hz), 6.92 (1H, t, J=7.2 Hz), 3.75-3.66 (2H, m), 2.67-2.58 (5H, m), 2.61 (3H, d, J=4.6 Hz), 2.27-2.20 (1H, m), 2.01-1.92 (2H, m), 1.89-1.81 (1H, m); LCMS: 573 [M+H].

Example 30 Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]acetamide trihydrochloride Step 1: Synthesis of N-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}acetamide

A mixture of N-[1-(3-bromophenyl)piperidin-4-yl]acetamide (338 mg, 1.14 mmol), bis(pinacolato)diboron (347 mg, 1.36 mmol), Pd(dppf)Cl₂.DCM (47 mg, 0.0570 mmol) and potassium acetate (336 mg, 3.42 mmol) in dioxane (3 mL) was heated at 80° C. for 18 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (CH₂Cl₂/MeOH=100:0→90:10) to afford desired product (397 mg, quant) as dark brown solid.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.38 (d, J=2.9 Hz, 1H), 7.31 (d, J=7.4 Hz, 1H), 7.28-7.25 (m, 1H), 7.05-7.02 (m, 1H), 5.35 (d, J=8.6 Hz, 1H), 3.98-3.90 (m, 1H), 3.65 (dt, J=12.6 Hz and 3.4 Hz, 2H), 2.87 (td, J=12.6 Hz and 2.3 Hz, 2H), 2.06-2.02 (m, 2H), 1.99 (s, 3H), 1.59-1.51 (m, 2H), 1.34 (s, 12H); LCMS: 345 [M+H].

Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]acetamide trihydrochloride

Step 2: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), N-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}acetamide (53 mg, 0.153 mmol), Pd(dppf)₂Cl₂.DCM (8 mg, 0.0102 mmol), and 2M Na₂CO₃ aq. (0.056 mL, 0.112 mmol) in DME (2.5 mL) was treated with microwave (130° C. for 1 hour, then 160° C. for 2 hours). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (CH₂Cl₂/MeOH=20:1×3) to afford desired product (39 mg, 57%) as brown solid.

Step 3: de-Boc

Starting material (39 mg, 0.0580 mmol) in MeOH (0.5 mL) was added 4N HCl-dioxane (2 mL) and stirred at r.t for 16.5 hours. The mixture was concentrated to afford desired product (39 mg, 99%) as brown solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.85-8.82 (m, 2H), 8.40-8.36 (m, 1H), 8.34-8.22 (m, 1H), 8.15 (dd, J=6.3 Hz and 1.7 Hz, 1H), 8.10 (d, J=8.6 Hz, 1H), 8.05-7.95 (m, 1H), 7.89-7.85 (m, 1H), 7.75 (d, J=8.6 Hz, 2H), 7.69 (d, J=8.6 Hz, 2H), 7.61-7.39 (m, 2H), 6.88 (t, J=6.3 Hz, 1H), 3.73-3.63 (m, 5H), 3.52-3.45 (m, 1H), 2.68-2.56 (m, 4H), 2.29-2.16 (m, 2H), 1.97-1.89 (m, 2H), 1.89-1.76 (m, 5H); LCMS: 573 [M+H].

Example 31 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-aminopiperidin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine tetrahydrochloride Step 1: Synthesis of tert-butyl {1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}carbamate

A mixture of tert-butyl [1-(3-bromophenyl)piperidin-4-yl]carbamate (80 mg, 0.225 mmol), bis(pinacolato)diboron (69 mg, 0.270 mmol), Pd(dppf)Cl₂.DCM (9 mg, 0.0113 mmol) and potassium acetate (66 mg, 0.675 mmol) in dioxane (3 mL) was heated at 80° C. for 43 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (hexane/AcOEt=90:10→75:25) to afford desired product (99 mg, quant) as pale yellow solid.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.38 (d, J=2.9 Hz, 1H), 7.30 (d, J=7.4 Hz, 1H), 7.27-7.24 (m, 1H), 7.05-7.02 (m, 1H), 4.51-4.45 (m, 1H), 3.66-3.59 (m, 3H), 2.84 (td, J=12.0, 1.7 Hz, 2H), 2.06-2.03 (m, 2H), 1.56-1.50 (m, 2H), 1.53 (s, 12H), 1.44 s (, 9H); LCMS: 403 [M+H].

Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-aminopiperidin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine tetrahydrochloride

Step 2: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (101 mg, 0.205 mmol), tert-butyl {1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}carbamate (99 mg, 0.246 mmol), Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (15 mg, 0.0205 mmol), and 2M Na₂CO₃ aq. (0.113 mL, 0.226 mmol) in DMF (3.5 mL) was treated with microwave (160° C. for 1 hour). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (AcOEt only ×2), and further purified by preparative thin-layer chromatography (CH₂Cl₂/AcOEt=5:2×2) to afford desired product (66 mg, 51%) as pale yellow oil.

Step 3: de-Boc

Starting material (66 mg, 0.105 mmol) in MeOH (1 mL) was added 4N HCl-dioxane (3 mL) and stirred at r.t for 16 hours. The mixture was concentrated to afford desired product (59 mg, 83%) as yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.85-8.81 (m, 2H), 8.34 (d, J=8.6 Hz, 1H), 8.15-8.12 (m, 1H), 8.11-8.09 (m, 1H), 8.07 (d, J=8.6 Hz, 1H), 7.83-7.78 (m, 1H), 7.75 (d, J=8.6 Hz, 2H), 7.68 (d, J=8.6 Hz, 2H), 7.52-7.46 (m, 1H), 7.35-7.32 (m, 1H), 7.09-7.03 (m, 1H), 6.86-6.80 (m, 1H), 3.85-3.81 (m, 4H), 3.50-3.45 (m, 1H), 3.27-3.21 (m, 2H), 2.92-2.83 (m, 2H), 2.68-2.58 (m, 4H), 2.28-2.18 (m, 2H), 2.03-1.97 (m, 2H), 1.89-1.82 (m, 2H), 1.73-1.64 (m, 2H); LCMS: 531 [M+H].

Example 32 Synthesis of methyl [1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]carbamate trihydrochloride Step 1: Synthesis of methyl {1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}carbamate

A mixture of methyl [1-(3-bromophenyl)piperidin-4-yl]carbamate (127 mg, 0.406 mmol), bis(pinacolato)diboron (124 mg, 0.487 mmol), Pd(dppf)Cl₂.DCM (17 mg, 0.0203 mmol) and potassium acetate (120 mg, 1.22 mmol) in dioxane (4 mL) was heated at 80° C. for 17.5 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (hexane/AcOEt=75:25→50:50) to afford desired product (102 mg, 70%) as pale yellow solid.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.51-7.48 (m, 1H), 7.37-7.35 (m, 1H), 7.27-7.24 (m, 1H), 7.06-7.02 (m, 1H), 5.86-5.80 (m, 1H), 3.69-3.63 (m, 5H), 2.89-2.82 (m, 2H), 2.05-1.99 (m, 2H), 1.65-1.56 (m, 2H), 1.34 (s, 12H); LCMS: 361 [M+H].

Synthesis of methyl [1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]carbamate trihydrochloride

Step 2: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (70 mg, 0.142 mmol), methyl {1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}carbamate (102 mg, 0.283 mmol), Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (10 mg, 0.0142 mmol), and 2M Na₂CO₃ aq. (0.078 mL, 0.156 mmol) in DMF (3 mL) was treated with microwave (160° C. for 1 hour). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (AcOEt only ×2), then preparative thin-layer chromatography (AcOEt/MeOH=20:1), and further purified by NH silica gel column chromatography (hexane/AcOEt=50:50→35:65) to afford desired product (38 mg, 39%) as yellow solid.

Step 3: de-Boc

Starting material (38 mg, 0.0552 mmol) in MeOH (0.5 mL) was added 4N HCl-dioxane (2 mL) and stirred at r.t for 13.5 hours. The mixture was concentrated to afford desired product (36 mg, 93%) as pale yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.86-8.82 (m, 2H), 8.41-8.38 (m, 1H), 8.16 (dd, J=5.7 Hz and 1.7 Hz, 1H), 8.10 (d, J=8.6 Hz, 1H), 7.92-7.87 (m, 1H), 7.75 (d, J=8.6 Hz, 2H), 7.69 (d, J=8.6 Hz, 2H), 7.52-7.31 (m, 2H), 7.29-7.26 (m, 1H), 7.18-7.13 (m, 1H), 6.89 (t, J=6.3 Hz, 1H), 3.73-3.65 (m, 4H), 3.55 (s, 3H), 3.51-3.44 (m, 1H), 2.71-2.56 (m, 4H), 2.26-2.16 (m, 2H), 2.00-1.91 (m, 2H), 1.91-1.80 (m, 2H); LCMS: 589 [M+H].

Example 33 Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]methanesulfonamide

A solution of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-aminopiperidin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine tetrahydrochloride (49 mg, 0.0731 mmol) in CH₂Cl₂ (2 mL) was added triethylamine (0.061 mL, 0.439 mmol), then methanesulfonyl chloride (0.006 mL, 0.0804 mmol) at 0° C. and stirred at r.t for 3.5 hours. The mixture was diluted with AcOEt, washed with 0.5N NaOH, brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (CH₂Cl₂/MeOH=5:1) to afford desired product (24 mg, 54%) as pale yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.24 (d, J=8.6 Hz, 1H), 8.02 (dd, J=4.6, 1.7 Hz, 1H), 7.98 (d, J=8.6 Hz, 1H), 7.64 (d, J=8.6 Hz, 2H), 7.62-7.61 (m, 1H), 7.48 (d, J=8.6 Hz, 2H), 7.42 (d, J=7.2 Hz, 1H), 7.29-7.24 (m, 2H), 7.14 (d, J=7.2 Hz, 1H), 7.00-6.97 (m, 3H), 6.43 (dd, J=7.2 Hz and 3.6 Hz, 1H), 3.71 (d, J=12.6 Hz, 2H), 2.95 (s, 3H), 2.84 (t, J=12.6 Hz, 2H), 2.50-2.44 (m, 4H), 2.23-2.18 (m, 2H), 2.10-2.01 (m, 1H), 1.93-1.89 (m, 2H), 1.78-1.69 (m, 1H), 1.59-1.51 (m, 2H); LCMS: 609 [M+H].

Example 34 Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]-N-methylacetamide trihydrochloride Step 1: Synthesis of N-[1-(3-bromophenyl)-4-piperidyl]acetamide

A mixture of 1,3-dibromobenzene (7.98 mL, 49.2 mmol), N-(4-piperidyl)acetamide (7.00 g, 49.2 mmol), Pd₂(dba)₃ (2.25 g, 2.46 mmol), (rac)-BINAP (2.30 g, 3.69 mmol) and sodium tert-butoxide (5.68 g, 59.1 mmol) in toluene (492 mL) was heated at 80° C. for 17 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (hexane/AcOEt=50:50 to 0:100) to afford the desired product (11.6 g, 80%) as pale orange solid.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.09 (1H, t, J=8.3 Hz), 7.04 (1H, t, J=1.7 Hz), 6.95-6.93 (1H, m), 6.83 (1H, dd, J=8.3, 1.7 Hz), 5.37-5.35 (1H, m), 3.99-3.91 (1H, m), 3.64-3.60 (2H, m), 2.88 (2H, td, J=12.6, 2.3 Hz), 2.06-2.01 (2H, m), 1.99 (3H, s), 1.56-1.48 (2H, m); LCMS: 297, 299 [M+H].

Step 2: Synthesis of N-[1-(3-bromophenyl)piperidin-4-yl]-N-methylacetamide

A solution of N-[1-(3-bromophenyl)-4-piperidyl]acetamide (11.6 g, 39.2 mmol) in THF (392 mL) was added to sodium hydride (6.84 g, 55% in mineral oil, 157 mmol) portionwise at 0° C. and stirred at room temperature for 10 minutes under nitrogen. The reaction mixture was added to iodomethane (7.32 mL, 118 mmol) at 0° C. and stirred at room temperature for 6 hours. The mixture was slowly quenched with water at 0° C. and extracted with EtOAc. The organic layer was washed with brine, dried over Na₂SO₄ and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (hexane/AcOEt=80:20→0:100) to afford desired product (12.6 g, quant.) as brown oil.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.13-7.08 (1H, m), 7.06-7.04 (1H, m), 6.99-6.93 (1H, m), 6.86-6.82 (1H, m), 4.70-4.63 (1H, m), 3.79-3.65 (2H, m), 2.90-2.78 (5H, m), 2.17 (1H, s), 2.11 (2H, s), 2.00-1.92 (0.5H, m), 1.82-1.73 (2H, m), 1.71-1.67 (1.5H, m); LCMS: 311, 313 [M+H].

Step 3: Synthesis of N-methyl-N-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}acetamide

A mixture of N-[1-(3-bromophenyl)piperidin-4-yl]-N-methylacetamide (68 mg, 0.217 mmol), bis(pinacolato)diboron (66 mg, 0.260 mmol), Pd(dppf)Cl₂.DCM (9 mg, 0.0109 mmol) and potassium acetate (64 mg, 0.651 mmol) in dioxane (3 mL) was heated at 80° C. for 13 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (hexane/AcOEt=35:65→0:100) to afford desired product (61 mg, 78%) as white solid.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.41-7.38 (m, 1H), 7.35-7.28 (m, 2H), 7.06-7.03 (m, 1H), 4.68-4.61 (m, 1H), 3.84-3.76 (m, 2H), 2.88 (s, 2H), 2.85 (s, 1H), 2.83-2.76 (m, 2H), 2.16 (s, 1H), 2.11 (s, 2H), 2.02-1.92 (m, 1H), 1.83-1.76 (m, 2H), 1.72-1.69 (m, 1H), 1.34-1.34 (m, 12H); LCMS: 359 [M+H].

Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]-N-methylacetamide trihydrochloride

Step 4: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (56 mg, 0.113 mmol), N-methyl-N-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}acetamide (61 mg, 0.170 mmol), Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (8 mg, 0.0113 mmol), and 2M Na₂CO₃ aq. (0.062 mL, 0.124 mmol) in DMF (2.5 mL) was treated with microwave (160° C. for 1 hour). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (AcOEt/MeOH=20:1), and further purified by preparative thin-layer chromatography (CH₂Cl₂/MeOH=20:1×2) to afford desired product (14 mg, 18%) as yellow solid.

Step 5: de-Boc

Starting material (14 mg, 0.0204 mmol) in MeOH (1 mL) was added 4N HCl-dioxane (3 mL) and stirred at r.t for 14 hours. The mixture was concentrated to afford desired product (19 mg, quant) as pale yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.86-8.82 (m, 2H), 8.41-8.37 (m, 1H), 8.36-8.23 (m, 2H), 8.27 (dd, J=10.0 Hz and 5.0 Hz, 1H), 8.15 (d, J=6.3 Hz, 1H), 7.89-7.87 (m, 1H), 7.75 (dd, J=8.6 Hz and 2.9 Hz, 2H), 7.69 (d, J=8.6 Hz, 2H), 7.51-7.36 (m, 2H), 6.88 (t, J=6.9 Hz, 1H), 3.74-3.64 (m, 2H), 3.50-3.45 (m, 3H), 2.85 (s, 2H), 2.70 (s, 1H), 2.68-2.57 (m, 4H), 2.26-2.18 (m, 2H), 2.10 (s, 1H), 2.02 (s, 2H), 1.90-1.82 (m, 2H), 1.82-1.80 (m, 1H), 1.67-1.60 (m, 2H); LCMS: 587 [M+H].

Example 35 Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-morpholin-4-ylpiperidin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine tetrahydrochloride Step 1: Synthesis of 4-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}morpholine

A mixture of 4-[1-(3-bromophenyl)piperidin-4-yl]morpholine (326 mg, 1.01 mmol), bis(pinacolato)diboron (306 mg, 1.21 mmol), Pd(dppf)Cl₂.DCM (41 mg, 0.0505 mmol) and potassium acetate (297 mg, 3.03 mmol) in dioxane (3 mL) was heated at 80° C. for 18 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (CH₂Cl₂/MeOH=100:0-95:5) to afford desired product (444 mg, quant) as dark brown oil.

500 M Hz ¹H-NMR (CDCl₃) δ: 7.38 (d, J=2.3 Hz, 1H), 7.30-7.24 (m, 2H), 7.05-7.03 (m, 1H), 3.78-3.70 (m, 4H), 2.72 (td, J=12.0 Hz and 2.3 Hz, 2H), 2.59 (t, J=4.0 Hz, 4H), 2.35-2.29 (m, 1H), 1.95-1.93 (m, 4H), 1.66 (ddd, J=24.1 Hz and 12.0 Hz and 4.0 Hz, 2H), 1.33 (s, 12H); LCMS: 373 [M+H].

Synthesis of 3-{3-[4-(1-aminocyclobutyl)phenyl]-5-[3-(4-morpholin-4-ylpiperidin-1-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine tetrahydrochloride

Step 2: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50 mg, 0.102 mmol), 4-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}morpholine (114 mg, 0.306 mmol), Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (14 mg, 0.0204 mmol), and 2M Na₂CO₃ aq. (0.056 mL, 0.112 mmol) in DMF (2.5 mL) was treated with microwave (160° C. for 2 hours). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (CH₂Cl₂/MeOH=10:1), and further purified by NH silica gel column chromatography (AcOEt only) to afford desired product (26 mg, 36%) as yellow solid.

Step 3: de-Boc

Starting material (26 mg, 0.0371 mmol) in MeOH (1 mL) was added 4N HCl-dioxane (3 mL) and stirred at r.t for 67 hours. The mixture was concentrated to afford desired product (25 mg, 90%) as yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.89-8.82 (m, 2H), 8.35 (d, J=8.6 Hz, 1H), 8.14 (dd, J=6.9 Hz and 1.7 Hz, 1H), 8.09 (d, J=8.6 Hz, 1H), 7.85-7.81 (m, 1H), 7.76 (d, J=8.6 Hz, 2H), 7.68 (d, J=8.6 Hz, 2H), 7.51-7.49 (m, 1H), 7.33 (t, J=8.6 Hz, 1H), 7.21-7.12 (m, 1H), 7.10-7.06 (m, 1H), 6.88-6.83 (m, 1H), 4.01-3.94 (m, 3H), 3.89-3.84 (m, 2H), 3.41-3.33 (m, 2H), 3.14-3.06 (m, 2H), 2.82-2.73 (m, 2H), 2.66-2.60 (m, 3H), 2.26-2.19 (m, 2H), 1.88-1.81 (m, 2H), 1.28-1.13 (m, 3H), 0.87-0.77 (m, 2H); LCMS: 601 [M+H].

Example 36 Synthesis of 8-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-8-azabicyclo[3.2.1]octan-3-ol trihydrochloride Step 1: Synthesis of 8-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-8-azabicyclo[3.2.1]octan-3-ol

A mixture of 8-(3-bromophenyl)-8-azabicyclo[3.2.1]octan-3-ol (58 mg, 0.206 mmol), bis(pinacolato)diboron (63 mg, 0.247 mmol), Pd(dppf)Cl₂.DCM (8 mg, 0.0103 mmol) and potassium acetate (61 mg, 0.618 mmol) in dioxane (3 mL) was heated at 80° C. for 14.5 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAct, washed with water, brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by silica gel column chromatography (hexane/AcOEt=85:15→75:25) to afford desired product (37 mg, 55%) as colorless oil.

Synthesis of 8-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-8-azabicyclo[3.2.1]octan-3-ol trihydrochloride

Step 2: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (55 mg, 0.112 mmol), 8-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-8-azabicyclo[3.2.1]octan-3-ol (37 mg, 0.112 mmol), Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (8 mg, 0.0112 mmol), and 2M Na₂CO₃ aq. (0.062 mL, 0.123 mmol) in DMF (3 mL) was treated with microwave (160° C. for 1 hour). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (CH₂Cl₂/MeOH=20:1×2) to afford desired product (8 mg, 11%) as yellow solid.

Step 3: de-Boc

Starting material (8 mg, 0.0122 mmol) in MeOH (0.5 mL) was added 4N HCl-dioxane (2 mL) and stirred at r.t for 18 hours. The mixture was concentrated to afford desired product (10 mg, quant) as yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.92-8.87 (2H, m), 8.53-8.43 (m, 1H), 8.38-8.32 (m, 1H), 8.17 (d, J=7.4 Hz, 1H), 8.08-8.02 (m, 1H), 7.92 (d, J=7.4 Hz, 1H), 7.76 (d, J=9.2 Hz, 2H), 7.69 (d, J=9.2 Hz, 2H), 7.62-7.54 (m, 1H), 7.37-7.22 (m, 2H), 6.91 (t, J=7.4 Hz, 1H), 4.29-4.25 (m, 1H), 3.72-3.65 (m, 4H), 3.51-3.45 (m, 4H), 2.63 (t, J=8.0 Hz, 3H), 2.36-2.31 (m, 2H), 2.25-2.19 (m, 1H), 1.95-1.90 (m, 2H), 1.88-1.80 (m, 1H), 1.63-1.54 (m, 1H); LCMS: 558 [M+H].

Example 37 Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]-2-methoxyacetamide trihydrochloride Step 1: Synthesis of 2-methoxy-N-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}acetamide

A mixture of N-[1-(3-bromophenyl)piperidin-4-yl]-2-methoxyacetamide (66 mg, 0.202 mmol), bis(pinacolato)diboron (61 mg, 0.242 mmol), Pd(dppf)Cl₂.DCM (8 mg, 0.0101 mmol) and potassium acetate (59 mg, 0.606 mmol) in dioxane (3 mL) was heated at 80° C. for 15.5 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAct, washed with water, brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by silica gel column chromatography (hexane/AcOEt=25:75→0:100) to afford desired product (61 mg, 81%) as pale yellow solid. LCMS: 375 [M+H].

Synthesis of N-[1-(3-{3-[4-(1-aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)piperidin-4-yl]-2-methoxyacetamide trihydrochloride

Step 2: Coupling

(1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate. A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (53 mg, 0.109 mmol), 2-methoxy-N-{1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperidin-4-yl}acetamide (61 mg, 0.163 mmol), Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (8 mg, 0.0109 mmol), and 2M Na₂CO₃ aq. (0.065 mL, 0.131 mmol) in DMF (3 mL) was treated with microwave (160° C. for 1 hour). The mixture was diluted with AcOEt, then washed with water(×3), brine, dried over Na₂SO₄, then filtrated. The filtrate was concentrated and the residue was purified by preparative thin-layer chromatography (AcOEt only ×2), then preparative thin-layer chromatography (CH₂Cl₂/MeOH=20:1×2) to afford desired product (17 mg, 22%) as pale yellow solid.

Step 3: de-Boc

Starting material (17 mg, 0.0242 mmol) in MeOH (1 mL) was added 4N HCl-dioxane (2 mL) and stirred at r.t for 2.5 hours. The mixture was concentrated to afford desired product (18 mg, quant) as pale yellow solid.

500 M Hz ¹H-NMR (DMSO-d₆) δ: 8.80-8.77 (m, 2H), 8.36 (dd, J=8.6, 2.9 Hz, 1H), 8.14 (dd, J=6.3, 1.7 Hz, 1H), 8.08 (d, J=8.6 Hz, 1H), 7.86-7.80 (m, 2H), 7.74 (d, J=8.6 Hz, 2H), 7.69 (d, J=8.6 Hz, 2H), 7.43-7.33 (m, 1H), 6.87-6.82 (m, 1H), 3.93-3.85 (m, 1H), 3.80 (s, 2H), 3.78-3.69 (m, 3H), 3.68-3.64 (m, 1H), 3.31 (s, 3H), 3.04-2.79 (m, 2H), 2.68-2.56 (m, 4H), 2.24-2.17 (m, 1H), 1.90-1.79 (m, 3H), 1.77-1.68 (m, 1H); LCMS: 603 [M+H].

Example 38 Synthesis of 3-(3-[4-(1-Aminocyclobutyl)phenyl]-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine trihydrochloride

Step 1: cis-4-(3-Bromophenyl)-2,6-dimethylmorpholine

A mixture of 1,3-dibromobenzene (242 μL, 2.00 mmol), cis-2,6-dimethylmorpholine (248 μL, 2.00 mmol), Pd₂(dba)₃ (45.8 mg, 0.0500 mmol), rac-BINAP (96.3 mg, 0.150 mmol) and NaOtBu (231 mg, 2.40 mmol) in toluene was heated at 80° C. for 11 hours under nitrogen. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=98:2→97:3) to afford desired product (356 mg, 65.8%) as pale yellow oil.

400 MHz ¹H-NMR (CDCl₃) δ: 7.11 (t, J=7.9 Hz, 1H), 7.03-6.99 (m, 1H), 6.99-6.94 (m, 1H), 6.81 (dd, J=8.4, 2.5 Hz, 1H), 3.84-3.71 (m, 2H), 3.49-3.36 (m, 2H), 2.47-2.37 (m, 2H), 1.26 (d, J=6.3 Hz, 6H).

Step 2: cis-2,6-Dimethyl-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine

A mixture of cis-4-(3-bromophenyl)-2,6-dimethylmorpholine (356 mg, 1.32 mmol), bis(pinacolato)diboron (368 mg, 1.45 mmol), Pd(dppf)Cl₂.DCM (215 mg, 0.263 mmol) and potassium acetate (400 mg, 3.95 mmol) in dioxane (5 mL) was heated at 80° C. for 11 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=95:5→90:10) to afford desired product (312 mg, 74.7%) as orange oil.

500 MHz ¹H-NMR (CDCl₃) δ: 7.39-7.25 (m, 3H), 7.04-6.99 (m, 1H), 3.84-3.76 (m, 2H), 3.53-3.46 (m, 2H), 2.42 (dd, J=12.0 Hz and 10.3 Hz, 2H), 1.34 (s, 12H), 1.26 (d, J=6.3 Hz, 6H).

Step 3: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), cis-2,6-dimethyl-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine (58.5 mg, 0.153 mmol), Pd(dppf)₂Cl₂.DCM (8.32 mg, 0.0102 mmol), and 2M NaOH aq. (0.150 mL, 0.310) in DME (2 mL) was heated at 80° C. for 10 hours under nitrogen. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (CHCl₃/EtOAc=2:1→1:1→1:2) to afford desired product (29.0 mg, 44.1%) as pale yellow foam.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.6 Hz, 1H), 8.07-8.03 (m, 1H), 7.79 (d, J=8.2 Hz, 1H), 7.66-7.49 (m, 4H), 7.46-7.40 (m, 2H), 7.36-7.29 (m, 1H), 7.16-7.08 (m, 1H), 6.93 (dd, J=7.9 Hz and 2.3 Hz, 1H), 6.73-6.55 (m, 2H), 6.34 (dd, J=7.7 Hz and 5.0 Hz, 1H), 5.23 (br s, 1H), 3.91-3.77 (m, 2H), 3.59-3.44 (m, 2H), 2.69-2.33 (m, 6H), 2.24-2.10 (m, 1H), 2.01-1.82 (m, 1H), 1.40 (br s, 9H), 1.28 (d, J=5.9 Hz, 6H).

Step 4: 3-(3-[4-(1-Aminocyclobutyl)phenyl]-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine trihydrochloride

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[cis-2,6-dimethylmorpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (29.0 mg, 0.0449 mmol) was dissolved in DCM (1 mL). 4M HCl/dioxane (1 mL) was added to the mixute and stirred at room temperature for 2 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (27.9 mg, 94.7%) as pale yellow solid.

400 MHz ¹H-NMR (DMSO-d₆) δ: 8.82 (br s, 2H), 8.35 (d, J=8.7 Hz, 1H), 8.17-8.13 (m, 1H), 8.10 (d, J=8.7 Hz, 1H), 7.89-7.82 (m, 1H), 7.74 (d, J=8.7 Hz, 2H), 7.69 (d, J=8.7 Hz, 2H), 7.65 (br s, 1H), 7.51 (d, J=7.8 Hz, 1H), 7.32 (t, J=8.0 Hz, 1H), 7.04 (d, J=7.8 Hz, 1H), 6.91-6.83 (m, 1H), 3.80-3.61 (m, 4H), 2.71-2.53 (m, 4H), 2.39-2.16 (m, 3H), 1.92-1.79 (m, 1H), 1.19 (d, J=6.0 Hz, 6H); LCMS: 546 [M+H].

Example 39 Synthesis of 3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-[3-(1,1-dioxidothiomorpholin-4-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine trihydrochloride

Step 1: 4-(3-Bromophenyl)thiomorpholine 1,1-dioxide

A mixture of 1,3-dibromobenzene (242 μL, 2.00 mmol), thiomorpholine 1,1-dioxide (270 mg, 2.00 mmol), Pd₂(dba)₃ (45.8 mg, 0.0500 mmol), rac-BINAP (96.3 mg, 0.150 mmol) and NaOtBu (231 mg, 2.40 mmol) in toluene was heated at 80° C. for 11 hours under nitrogen. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=90:10→80:20→75:25) to afford desired product (281 mg, 48.4%) as pale yellow solid.

400 MHz ¹H-NMR (CDCl₃) δ: 7.16 (t, J=8.4 Hz, 1H), 7.07-7.02 (m, 2H), 6.85-6.80 (m, 1H), 3.95-3.76 (m, 4H), 3.20-3.02 (m, 4H).

Step 2: 4-[3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]thiomorpholine 1,1-dioxide

A mixture of 4-(3-bromophenyl)thiomorpholine 1,1-dioxide (281 mg, 0.968 mmol), bis(pinacolato)diboron (270 mg, 1.06 mmol), Pd(dppf)Cl₂.DCM (158 mg, 0.194 mmol) and potassium acetate (294 mg, 2.90 mmol) in dioxane (5 mL) was heated at 80° C. for 11 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=90:10→85:15→80:20→17:25) to afford desired product (247 mg, 75.7%) as white solid.

400 MHz ¹H-NMR (CDCl₃) δ: 7.39 (d, J=7.2 Hz, 1H), 7.36 (d, J=2.3 Hz, 1H), 7.31 (t, J=7.7 Hz, 1H), 7.06-6.99 (m, 1H), 3.93-3.79 (m, 4H), 3.18-3.05 (m, 4H), 1.34 (s, 12H).

Step 3: tert-Butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[3-(1,1-dioxidothiomorpholin-4-yl)phenyl]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), 4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]thiomorpholine 1,1-dioxide (51.5 mg, 0.153 mmol), Pd(dppf)₂Cl₂.DCM (8.32 mg, 0.0102 mmol), and 2M NaOH aq. (0.150 mL, 0.310) in DME (2 mL) was heated at 80° C. for 10 hours under nitrogen. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (CHCl₃/EtOAc=2:1→1:1→1:2) to afford desired product (38.4 mg, 56.6%) as pale yellow foam.

400 MHz ¹H-NMR (CDCl₃) δ: 8.18-8.01 (m, 2H), 7.82-7.71 (m, 1H), 7.70-7.50 (m, 4H), 7.47-7.33 (m, 3H), 7.20-7.09 (m, 1H), 6.99-6.88 (m, 1H), 6.77-6.60 (m, 2H), 6.43-6.29 (m, 1H), 5.34 (br s, 1H), 4.00-3.83 (m, 4H), 3.21-3.05 (m, 4H), 2.70-2.34 (m, 4H), 2.26-2.11 (m, 1H), 2.06-1.82 (m, 1H), 1.41 (br s, 9H).

Step 4: 3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-[3-(1,1-dioxidothiomorpholin-4-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine trihydrochloride

tert-Butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[3-(1,1-dioxidothiomorpholin-4-yl)phenyl]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate (29.0 mg, 0.0449 mmol) was dissolved in DCM (1 mL). 4M HCl/dioxane (1 mL) was added to the mixture and stirred at room temperature for 2 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (33.2 mg, 85.1%) as pale yellow solid.

400 MHz ¹H-NMR (DMSO-d₆) δ: 8.85 (br s, 2H), 8.35 (d, J=8.7 Hz, 1H), 8.14 (dd, J=6.0 Hz and 1.4 Hz, 1H), 8.11 (d, J=8.7 Hz, 1H), 7.85-7.72 (m, 3H), 7.71-7.64 (m, 3H), 7.51 (d, J=7.8 Hz, 1H), 7.35 (t, J=8.0 Hz, 1H), 7.10 (dd, J=8.2 Hz and 2.3 Hz, 1H), 6.88-6.80 (m, 1H), 3.90-3.82 (m, 4H), 3.21-3.13 (m, 4H), 2.71-2.56 (m, 4H), 2.29-2.17 (m, 1H), 1.92-1.79 (m, 1H); LCMS [M+H]: 566.

Example 40 Synthesis of [(2R)-4-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)morpholin-2-yl]methanol trihydrochloride

Step 1: (2R)-2-[(Benzyloxy)methyl]-4-(3-bromophenyl)morpholine

400 MHz ¹H-NMR (CDCl₃) δ: 7.40-7.26 (m, 5H), 7.11 (t, J=8.0 Hz, 1H), 7.03-6.95 (m, 2H), 6.81 (dd, J=8.5 Hz and 2.5 Hz, 1H), 4.61 (d, J=11.9 Hz, 1H), 4.58 (d, J=11.9 Hz, 1H), 4.08-4.01 (m, 1H), 3.89-3.81 (m, 1H), 3.78 (td, J=11.4 Hz and 2.7 Hz, 1H), 3.59 (dd, J=10.1 Hz and 5.5 Hz, 1H), 3.53 (dd, J=10.1 Hz and 5.0 Hz, 1H), 3.52-3.46 (m, 1H), 3.42-3.35 (m, 1H), 2.87 (td, J=11.8 Hz and 3.5 Hz, 1H), 2.68-2.60 (m, 1H).

Step 2: (2R)-2-[(Benzyloxy)methyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine

400 MHz ¹H-NMR (CDCl₃) δ: 7.39-7.25 (m, 8H), 7.05-6.99 (m, 1H), 4.63 (d, J=11.9 Hz, 1H), 4.58 (d, J=11.9 Hz, 1H), 4.09-4.02 (m, 1H), 3.93-3.85 (m, 1H), 3.81 (td, J=11.6 Hz and 2.6 Hz, 1H), 3.63-3.51 (m, 3H), 3.49-3.42 (m, 1H), 2.87 (td, J=11.7 Hz and 3.4 Hz, 1H), 2.64 (dd, J=11.7, 10.5 Hz, 1H), 1.34 (s, 12H).

Step 3: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-(3-{(2R)-2-[(benzyloxy)methyl]morpholin-4-yl}phenyl)-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), (2R)-2-[(benzyloxy)methyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine (83.4 mg, 0.204 mmol), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (7.21 mg, 0.0102 mmol), and 2M NaOH aq. (0.150 mL, 0.310) in DME (2 mL) was heated at 160° C. for 2 hours under microwave irradiation. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (CHCl₃/MeOH=98:2) and PTLC (CHCl₃/MeOH=9:1) to afford desired product (31.5 mg, 41.9%) as pale yellow foam.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.2 Hz, 1H), 8.05 (dd, J=5.0 Hz and 1.8 Hz, 1H), 7.77 (d, J=8.2 Hz, 1H), 7.61-7.50 (m, 4H), 7.45-7.25 (m, 8H), 7.16-7.09 (m, 1H), 6.93 (dd, J=7.9 Hz and 2.0 Hz, 1H), 6.65 (br s, 2H), 6.35 (dd, J=7.7 Hz and 4.5 Hz, 1H), 5.26 (br s, 1H), 4.63 (d, J=12.2 Hz, 1H), 4.60 (d, J=12.2 Hz, 1H), 4.11-4.02 (m, 1H), 3.96-3.88 (m, 1H), 3.84 (td, J=11.4 Hz and 2.6 Hz, 1H), 3.66-3.42 (m, 4H), 3.01-2.83 (m, 1H), 2.73-2.65 (m, 1H), 2.63-2.26 (m, 4H), 2.23-2.09 (m, 1H), 2.05-1.83 (m, 1H), 1.40 (br s, 9H); LCMS [M+H]: 738.

Step 4: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2R)-2-(hydroxymethyl) morpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

10% Pd/C (30 mg) was added to a solution of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-(3-{(2R)-2-[(benzyloxy)methyl]morpholin-4-yl}phenyl)-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl) carbamate (31.5 mg, 0.0427 mmol) in MeOH (2 mL). The mixture was stirred at room temperature for 14 hours and 7.5 hours at 50° C. under hydrogen atmosphere. The catalyst was removed by filtration through a Celite pad and washed with MeOH. The combined filtrate and washings were concentrated. The residue was purified by PTLC (CHCl₃/MeOH=9:1) to afford desired compound (5.2 mg, 18.8%) as pale yellow solid.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.7 Hz, 1H), 8.08-8.03 (m, 1H), 7.80 (d, J=8.7 Hz, 1H), 7.71 (br s, 1H), 7.59-7.49 (m, 3H), 7.47-7.41 (m, 2H), 7.34 (t, J=8.0 Hz, 1H), 7.17-7.11 (m, 1H), 6.94 (dd, J=8.5 Hz and 2.5 Hz, 1H), 6.68 (br s, 2H), 6.37 (dd, J=7.8 Hz and 5.0 Hz, 1H), 5.31 (br s, 1H), 4.11-4.04 (m, 1H), 3.90-3.69 (m, 4H), 3.64-3.56 (m, 1H), 3.53-3.45 (m, 1H), 2.95-2.85 (m, 1H), 2.72 (dd, J=11.4 Hz and 10.5 Hz, 1H), 2.67-2.29 (m, 4H), 2.25-2.10 (m, 1H), 2.06-1.58 (m, 2H), 1.40 (br s, 9H); LCMS [M+H]: 648.

Step 5: [(2R)-4-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)morpholin-2-yl]methanol trihydrochloride

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2R)-2-(hydroxymethyl)morpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (5.20 mg, 0.00803 mmol) was dissolved in DCM (1 mL). 4M HCl/dioxane (1 mL) was added to the mixute and stirred at room temperature for 15 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (4.36 mg, 82.7%) as yellow solid.

400 MHz ¹H-NMR (CD₃OD) δ: 8.63-8.51 (m, 1H), 8.38 (d, J=8.2 Hz, 1H), 8.27-8.12 (m, 2H), 8.04 (d, J=6.0 Hz, 1H), 7.95-7.63 (m, 7H), 6.92-6.82 (m, 1H), 4.36-4.12 (m, 3H), 3.84-3.54 (m, 6H), 2.96-2.83 (m, 2H), 2.78-2.64 (m, 2H), 2.42-2.23 (m, 1H), 2.14-1.97 (m, 1H); LCMS [M+H]: 548.

Example 41 Synthesis of [(2S)-4-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)morpholin-2-yl]methanol trihydrochloride

Step 1: (2S)-2-[(Benzyloxy)methyl]-4-(3-bromophenyl)morpholine

400 MHz ¹H-NMR (CDCl₃) δ: 7.40-7.26 (m, 5H), 7.11 (t, J=8.0 Hz, 1H), 7.03-6.95 (m, 2H), 6.81 (dd, J=8.2 Hz and 1.8 Hz, 1H), 4.61 (d, J=12.4 Hz, 1H), 4.58 (d, J=12.4 Hz, 1H), 4.07-4.01 (m, 1H), 3.89-3.81 (m, 1H), 3.78 (td, J=11.7 Hz and 2.7 Hz, 1H), 3.59 (dd, J=10.1 Hz and 5.5 Hz, 1H), 3.53 (dd, J=10.1 Hz and 5.0 Hz, 1H), 3.52-3.46 (m, 1H), 3.41-3.35 (m, 1H), 2.86 (td, J=11.8 Hz and 3.4 Hz, 1H), 2.64 (dd, J=11.8 Hz and 10.5 Hz, 1H).

Step 2: (2S)-2-[(Benzyloxy)methyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine

400 MHz ¹H-NMR (CDCl₃) δ: 7.39-7.25 (m, 8H), 7.05-6.99 (m, 1H), 4.63 (d, J=12.4 Hz, 1H), 4.58 (d, J=12.4 Hz, 1H), 4.09-4.02 (m, 1H), 3.93-3.85 (m, 1H), 3.81 (td, J=11.4 Hz and 2.7 Hz, 1H), 3.64-3.51 (m, 3H), 3.49-3.42 (m, 1H), 2.87 (td, J=11.7 Hz and 3.4 Hz, 1H), 2.64 (dd, J=11.7 Hz and 10.5 Hz, 1H), 1.34 (s, 12H).

Step 3: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-(3-{(2S)-2-[(benzyloxy) methyl]morpholin-4-yl}phenyl)-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), (2S)-2-[(benzyloxy)methyl]-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine (82.4 mg, 0.204 mmol), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (7.21 mg, 0.0102 mmol), and 2M NaOH aq. (0.150 mL, 0.310) in DME (2 mL) was heated at 160° C. for 2 hours under microwave irradiation. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (CHCl₃/MeOH=98:2) and PTLC (CHCl₃/MeOH=9:1) to afford desired product (36.0 mg, 47.9%) as pale yellow foam.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.2 Hz, 1H), 8.05 (dd, J=4.8 Hz and 1.6 Hz, 1H), 7.77 (d, J=8.2 Hz, 1H), 7.61-7.51 (m, 4H), 7.44-7.25 (m, 8H), 7.16-7.09 (m, 1H), 6.93 (dd, J=7.9 Hz and 2.0 Hz, 1H), 6.65 (br s, 2H), 6.35 (dd, J=7.9 Hz and 4.8 Hz, 1H), 5.24 (br s, 1H), 4.64 (d, J=12.2 Hz, 1H), 4.60 (d, J=12.2 Hz, 1H), 4.11-4.02 (m, 1H), 3.96-3.89 (m, 1H), 3.84 (td, J=11.4 Hz and 2.6 Hz, 1H), 3.66-3.42 (m, 4H), 3.01-2.82 (m, 1H), 2.74-2.65 (m, 1H), 2.63-2.26 (m, 4H), 2.22-2.08 (m, 1H), 2.05-1.74 (m, 1H), 1.40 (br s, 9H); LCMS [M+H]: 738.

Step 4: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2S)-2-(hydroxymethyl) morpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

10% Pd/C (30 mg) was added to a solution of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-(3-{(2S)-2-[(benzyloxy) methyl]morpholin-4-yl}phenyl)-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl) carbamate (36.0 mg, 0.0488 mmol) in MeOH (2 mL). The mixture was stirred at room temperature for 14 hours and 7.5 hours at 50° C. under hydrogen atmosphere. The catalyst was removed by filtration through a Celite pad and washed with MeOH. The combined filtrate and washings were concentrated. The residue was purified by PTLC (CHCl₃/MeOH=9:1) to afford desired compound (4.6 mg, 14.6%) as pale yellow solid.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.2 Hz, 1H), 8.08-8.04 (m, 1H), 7.80 (d, J=8.7 Hz, 1H), 7.71 (br s, 1H), 7.59-7.49 (m, 3H), 7.46-7.41 (m, 2H), 7.34 (t, J=8.0 Hz, 1H), 7.18-7.11 (m, 1H), 6.94 (dd, J=8.0 Hz and 2.5 Hz, 1H), 6.67 (br s, 2H), 6.37 (dd, J=7.6 Hz and 4.8 Hz, 1H), 5.30 (br s, 1H), 4.11-4.04 (m, 1H), 3.90-3.69 (m, 4H), 3.66-3.55 (m, 1H), 3.53-3.44 (m, 1H), 2.95-2.85 (m, 1H), 2.72 (dd, J=11.4 Hz and 10.5 Hz, 1H), 2.66-2.30 (m, 4H), 2.25-2.10 (m, 1H), 2.05-1.55 (m, 2H), 1.40 (br s, 9H); LCMS [M+H]: 648.

Step 5: [(2S)-4-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)morpholin-2-yl]methanol trihydrochloride

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2S)-2-(hydroxymethyl)morpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (4.60 mg, 0.00710 mmol) was dissolved in DCM (1 mL). 4M HCl/dioxane (1 mL) was added to the mixute and stirred at room temperature for 15 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (3.42 mg, 73.3%) as pale yellow solid.

400 MHz ¹H-NMR (CD₃OD) δ: 8.58-8.48 (m, 1H), 8.38 (d, J=8.7 Hz, 1H), 8.25-8.12 (m, 2H), 8.08-8.01 (m, 1H), 7.92-7.64 (m, 7H), 6.91-6.82 (m, 1H), 4.32-4.12 (m, 3H), 3.81-3.52 (m, 6H), 2.97-2.84 (m, 2H), 2.78-2.64 (m, 2H), 2.40-2.24 (m, 1H), 2.14-1.97 (m, 1H); LCMS [M+H]: 548.

Example 42 Synthesis of 3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-[3-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine trihydrochloride

Step 1: 3-(3-Bromophenyl)-8-oxa-3-azabicyclo[3.2.1]octane

A mixture of 1,3-dibromobenzene (242 μL, 2.00 mmol), 8-oxa-3-azabicyclo[3.2.1]octane (226 mg, 2.00 mmol), Pd₂(dba)₃ (45.8 mg, 0.0500 mmol), rac-BINAP (96.3 mg, 0.150 mmol) and NaOtBu (231 mg, 2.40 mmol) in toluene was heated at 80° C. for 13 hours under nitrogen. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=9:1) to afford desired product (361 mg, 67.3%) as colorless oil.

400 MHz ¹H-NMR (CDCl₃) δ: 7.09 (t, J=8.2 Hz, 1H), 6.95-6.90 (m, 2H), 6.74-6.68 (m, 1H), 4.53-4.43 (m, 2H), 3.31-3.26 (m, 2H), 3.01 (dd, J=11.7 Hz and 2.5 Hz, 2H), 2.03-1.86 (m, 4H); LCMS [M+H]: 268.

Step 2: 3-[3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-8-oxa-3-azabicyclo[3.2.1]octane

A mixture of 3-(3-bromophenyl)-8-oxa-3-azabicyclo[3.2.1]octane (361 mg, 1.35 mmol), bis(pinacolato)diboron (376 mg, 1.48 mmol), Pd(dppf)Cl₂.DCM (220 mg, 0.269 mmol) and potassium acetate (409 mg, 4.04 mmol) in dioxane (10 mL) was heated at 80° C. for 14 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=95:5→90:10→80:20) to afford desired product (375 mg, 88.3%) as orange solid.

400 MHz ¹H-NMR (CDCl₃) δ: 7.30-7.23 (m, 3H), 6.94-6.87 (m, 1H), 4.53-4.42 (m, 2H), 3.39 (d, J=11.3 Hz, 2H), 3.01 (dd, J=11.3 Hz and 2.3 Hz, 2H), 2.00-1.89 (m, 4H), 1.33 (s, 12H); LCMS [M+H]: 316.

Step 3: tert-Butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[3-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)phenyl]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), 3-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-8-oxa-3-azabicyclo[3.2.1]octane (64.2 mg, 0.204 mmol), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (7.21 mg, 0.0102 mmol), and 2M NaOH aq. (0.150 mL, 0.310) in DMF (2 mL) was heated at 160° C. for 2 hours under microwave irradiation. After cooling to room temperature, the mixture was diluted with EtOAc and washed with water (5×) and brine. The combined organic layers were dried over anhydrous Na₂SO₄ and concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=1:4→1:2→1:1→2:1→EtOAc) to afford desired product (62.1 mg, 94.7%) as orange foam.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.2 Hz, 1H), 8.06 (dd, J=4.8 Hz and 1.6 Hz, 1H), 7.77 (d, J=8.7 Hz, 1H), 7.60-7.54 (m, 2H), 7.52-7.49 (m, 1H), 7.47-7.40 (m, 3H), 7.31 (t, J=7.8 Hz, 1H), 7.20-7.11 (m, 1H), 6.83 (dd, J=8.2 Hz and 2.3 Hz, 1H), 6.61 (br s, 2H), 6.35 (dd, J=7.8 Hz and 4.8 Hz, 1H), 5.16 (s, 1H), 4.55-4.45 (m, 2H), 3.39 (d, J=11.0 Hz, 2H), 3.06 (dd, J=11.4 Hz and 2.3 Hz, 2H), 2.75-2.29 (m, 4H), 2.23-2.10 (m, 1H), 2.03-1.85 (m, 5H), 1.40 (br s, 9H); LCMS [M+H]: 644.

Step 4: 3-{3-[4-(1-Aminocyclobutyl)phenyl]-5-[3-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)phenyl]-3H-imidazo[4,5-b]pyridin-2-yl}pyridin-2-amine trihydrochloride

tert-Butyl [1-(4-{2-(2-aminopyridin-3-yl)-5-[3-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)phenyl]-3H-imidazo[4,5-b]pyridin-3-yl}phenyl)cyclobutyl]carbamate (62.1 mg, 0.0965 mmol) was dissolved in DCM (1 mL)-MeOH (1 mL). 4M HCl/dioxane (1 mL) was added to the mixture and stirred at room temperature for 1.25 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (54.8 mg, 87.0%) as yellow solid.

400 MHz ¹H-NMR (DMSO-d₆) δ: 8.90 (br s, 2H), 8.34 (d, J=8.7 Hz, 1H), 8.17 (dd, J=6.2 Hz and 1.6 Hz, 1H), 8.07 (d, J=8.7 Hz, 1H), 7.92 (dd, J=7.6 Hz and 1.6 Hz, 1H), 7.80-7.74 (m, 2H), 7.72-7.66 (m, 2H), 7.54-7.49 (m, 1H), 7.45 (d, J=7.8 Hz, 1H), 7.29 (t, J=8.0 Hz, 1H), 6.95-6.88 (m, 2H), 4.50-4.43 (m, 2H), 3.51-3.44 (m, 2H), 2.90-2.82 (m, 2H), 2.69-2.58 (m, 4H), 2.31-2.15 (m, 1H), 1.98-1.69 (m, 5H); LCMS [M+H]: 544.

Example 43 Synthesis of 4-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylmorpholine-2-carboxamide trihydrochloride

Step 1: 4-Benzyl-N,N-dimethylmorpholine-2-carboxamide

Oxalyl chloride (372 μL, 4.27 mmol) was added to a mixture of 4-benzylmorpholine-2-carboxilic acid hydrochloride (1.00 g, 3.88 mmol) and N,N-dimethylformamide (15.0 μL, 0.194 mmol) in DCE (20 mL). The mixture was heated at 65° C. for 3 hours. After cooling to 0° C., Me₂NH (2M solution in THF, 9.70 mL, 19.4 mmol) was added. The mixture was stirred at room temperature for 4 hours. The mixture was concentrated and the residue was diluted with water and extracted with EtOAc (3×). The combined organic layers were dried over anhydrous Na₂SO₄ and concentrated to afford desired product (803 mg, 83.4%) as brown oil.

400 MHz ¹H-NMR (CDCl₃) δ: 7.40-7.21 (m, 5H), 4.28 (dd, J=10.3 Hz and 2.5 Hz, 1H), 3.97-3.90 (m, 1H), 3.71 (td, J=11.3 Hz and 2.4 Hz, 1H), 3.58 (d, J=13.3 Hz, 1H), 3.54 (d, J=13.3 Hz, 1H), 3.05 (s, 3H), 2.95-2.86 (m, 1H), 2.92 (s, 3H), 2.72-2.65 (m, 1H), 2.44-2.35 (m, 1H), 2.27 (td, J=11.4 Hz and 3.2 Hz, 1H); LCMS [M+H]: 249.

Step 2: N,N-Dimethylmorpholine-2-carboxamide

A mixture of 4-benzyl-N,N-dimethylmorpholine-2-carboxamide (803 mg, 3.23 mmol), ammonium formate (2.15 g, 32.3 mmol) and 10% Pd/C (400 mg) in EtOH (20 mL) was heated at 50° C. for 1 hour. After cooling to room temperature, the catalyst was filtered off, washed with EtOH. The combined filtrate and washings were concentrated, and the residue was dissolved in EtOH (20 mL). Ammonium formate (2.15 g, 32.3 mmol) and 10% Pd/C (400 mg) were added to the mixture. The mixture was heated at 50° C. for 1 hour. After cooling to room temperature, the catalyst was filtered off, washed with EtOH. The combined filtrate and washings were concentrated to afford desired product (506 mg, 98.9%) as colorless oil.

400 MHz ¹H-NMR (CDCl₃) δ: 4.44-4.37 (m, 1H), 3.93 (td, J=7.6 Hz and 3.8 Hz, 1H), 3.85-3.77 (m, 1H), 3.49 (br s, 1H), 3.19-3.14 (m, 2H), 3.09 (s, 3H), 3.04-2.99 (m, 2H), 2.96 (s, 3H); LCMS [M+H]: 159.

Step 3: 4-(3-Bromophenyl)-N,N-dimethylmorpholine-2-carboxamide

A mixture of 1,3-dibromobenzene (387 μL, 3.20 mmol), N,N-dimethylmorpholine-2-carboxamide (506 mg, 3.20 mmol), Pd₂(dba)₃ (73.3 mg, 0.0800 mmol), rac-BINAP (154 mg, 0.240 mmol) and NaOtBu (369 mg, 3.84 mmol) in toluene (8 mL) was heated at 80° C. for 5 hours under nitrogen. After cooling to room temperature, the mixture was diluted with DCM and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=95:5→90:10→80:20→67:33→50:50) to afford desired product (424 mg, 42.3%) as orange oil.

400 MHz ¹H-NMR (CDCl₃) δ: 7.12 (t, J=8.0 Hz, 1H), 7.08-7.06 (m, 1H), 7.02-6.98 (m, 1H), 6.88-6.84 (m, 1H), 4.33 (dd, J=10.1 Hz and 2.7 Hz, 1H), 4.07 (ddd, J=11.4 Hz, 3.2 Hz and 1.8 Hz, 1H), 3.80 (td, J=11.3 Hz and 2.9 Hz, 1H), 3.63-3.56 (m, 1H), 3.45-3.38 (m, 1H), 3.13 (s, 3H), 3.12 (dd, J=12.4 Hz and 10.1 Hz, 1H), 2.99 (s, 3H), 2.95 (td, J=11.9 Hz and 3.5 Hz, 1H); LCMS [M+H]: 313.

Step 4: N,N-Dimethyl-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine-2-carboxamide

A mixture of 4-(3-bromophenyl)-N,N-dimethyl morpholine-2-carboxamide (424 mg, 1.35 mmol), bis(pinacolato)diboron (378 mg, 1.49 mmol), Pd(dppf)Cl₂.DCM (221 mg, 0.271 mmol) and potassium acetate (411 mg, 4.06 mmol) in dioxane (10 mL) was heated at 80° C. for 11.5 hours under nitrogen. After cooling to room temperature, the mixture was diluted with EtOAc and filtered through a Celite pad. The combined filtrate and washings were concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=90:10→33:67→50:50) to afford desired product (309 mg, 63.4%) as orange solid.

400 MHz ¹H-NMR (CDCl₃) δ: 7.42-7.38 (m, 1H), 7.37-7.33 (m, 1H), 7.32-7.26 (m, 1H), 7.09-7.02 (m, 1H), 4.36 (dd, J=10.2 Hz and 2.5 Hz, 1H), 4.11-4.05 (m, 1H), 3.82 (td, J=11.6 Hz and 2.6 Hz, 1H), 3.71-3.63 (m, 1H), 3.53-3.45 (m, 1H), 3.13 (s, 3H), 3.09 (dd, J=12.2 Hz and 10.0 Hz, 1H), 2.98 (s, 3H), 2.94 (td, J=12.2 Hz and 3.2 Hz, 1H), 1.33 (s, 12H); LCMS [M+H]: 361.

Step 5: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[2-(dimethylcarbamoyl) morpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (50.0 mg, 0.101 mmol), N,N-dimethyl-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]morpholine-2-carboxamide (73.4 mg, 0.204 mmol), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (7.21 mg, 0.0102 mmol), and 2M NaOH aq. (0.150 mL, 0.310) in DMF (2 mL) was heated at 160° C. for 2 hours under microwave irradiation. After cooling to room temperature, the mixture was diluted with EtOAc and washed with water (5×). The combined organic layers were dried over anhydrous Na₂SO₄ and concentrated. The residue was purified by silica gel column chromatography (CHCl₃/EtOAc=1:1→1:2→EtOAc) to afford crude product. The crude product was slurried in ether and collected by filtration. After the solid was washed with ether to afford desired product (25.6 mg, 36.5%) as pale yellow solid.

400 MHz ¹H-NMR (CDCl₃) δ: 8.11 (d, J=8.2 Hz, 1H), 8.09-8.04 (m, 1H), 7.79 (d, J=8.2 Hz, 1H), 7.71-7.66 (m, 1H), 7.64-7.52 (m, 3H), 7.47-7.40 (m, 2H), 7.34 (t, J=8.0 Hz, 1H), 7.21-7.15 (m, 1H), 6.98 (dd, J=8.0 Hz and 2.1 Hz, 1H), 6.64 (br s, 2H), 6.37 (dd, J=7.6 Hz and 4.8 Hz, 1H), 5.47 (br s, 1H), 4.38 (dd, J=10.1 Hz and 2.3 Hz, 1H), 4.14-4.06 (m, 1H), 3.86 (td, J=11.4 Hz and 2.7 Hz, 1H), 3.74-3.66 (m, 1H), 3.55-3.48 (m, 1H), 3.20-3.11 (m, 1H), 3.15 (s, 3H), 3.03-2.93 (m, 1H), 3.02 (s, 3H), 2.76-2.32 (m, 4H), 2.24-2.08 (m, 1H), 2.01-1.85 (m, 1H), 1.39 (br s, 9H); LCMS [M+H]: 689.

Step 6: 4-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylmorpholine-2-carboxamide trihydrochloride

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[2-(dimethylcarbamoyl)morpholin-4-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (25.6 mg, 0.0372 mmol) was dissolved in DCM (1 mL)-MeOH (1 mL). 4M HCl/dioxane (1 mL) was added to the mixture and stirred at room temperature for 1.5 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (25.6 mg, 98.6%) as yellow solid.

400 MHz ¹H-NMR (DMSO-d₆) δ: 8.81 (br s, 2H), 8.35 (d, J=8.2 Hz, 1H), 8.16 (d, J=6.0 Hz, 1H), 8.10 (d, J=8.2 Hz, 1H), 7.94-7.87 (m, 1H), 7.80-7.66 (m, 5H), 7.54 (d, J=7.8 Hz, 1H), 7.35 (t, J=7.8 Hz, 1H), 7.10-7.03 (m, 1H), 6.93-6.86 (m, 1H), 4.42 (dd, J=10.1, 2.3 Hz, 1H), 4.05-3.97 (m, 1H), 3.86-3.21 (m, 3H), 3.09 (s, 3H), 2.95-2.86 (m, 1H), 2.88 (s, 3H), 2.83-2.73 (m, 1H), 2.72-2.56 (m, 4H), 2.29-2.16 (m, 1H), 1.92-1.78 (m, 1H); LCMS [M+H]: 589.

Example 44 Synthesis of 2-[(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)amino]ethanol trihydrochloride

Step 1: 2-{[3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino}ethanol

A mixture of 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (219 mg, 1.00 mmol), 2-bromoethanol (82.7 μL, 1.10 mmol) and N,N-diisopropylethylamine (261 μL, 1.50 mmol) in toluene (2 mL) was refluxed for 22 hours. After cooling to room temperature, the mixture was concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=2:1→1:1) to afford desired product (76.3 mg, 29.0%) as colorless oil.

400 MHz ¹H-NMR (CDCl₃) δ: 7.23-7.16 (m, 2H), 7.10 (d, J=2.7 Hz, 1H), 6.79-6.72 (m, 1H), 3.79 (t, J=5.2 Hz, 2H), 3.30 (t, J=5.2 Hz, 2H), 2.19 (br s, 1H), 1.33 (s, 12H); LCMS [M+H]: 264.

Step 2: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2-hydroxyethyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

A mixture of tert-butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-chloro-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (70.0 mg, 0.143 mmol), 2-{[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino}ethanol (75.0 mg, 0.285 mmol), bis(di-tert-butyl(4-dimethylaminophenyl) phosphine)dichloropalladium(II) (10.1 mg, 0.0143 mmol), and 2M NaOH aq. (0.430 mL, 0.214) in DMF (2 mL) was heated at 160° C. for 1 hour under microwave irradiation. After cooling to room temperature, the mixture was diluted with EtOAc and washed with water (3×) and brine. The combined organic layers were dried over anhydrous Na₂SO₄ and concentrated. The residue was purified by silica gel column chromatography (CHCl₃/EtOAc=1:1→1:2→EtOAc) to afford desired product (73.0 mg, 86.5%) as yellow solid.

500 MHz ¹H-NMR (CDCl₃) δ: 8.07 (d, J=8.0 Hz, 1H), 8.03 (d, J=4.0 Hz, 1H), 7.74 (d, J=8.0 Hz, 1H), 7.61-7.49 (m, 2H), 7.43-7.06 (m, 5H), 7.33 (d, J=8.0 Hz, 1H), 6.76-6.56 (m, 3H), 6.34 (dd, J=7.7 Hz and 4.9 Hz, 1H), 5.59-5.16 (m, 1H), 3.83 (t, J=5.2 Hz, 2H), 3.39-3.27 (m, 2H), 2.67-2.08 (m, 6H), 1.99-1.84 (m, 1H), 1.64-1.03 (m, 9H); LCMS [M+H]: 592.

Step 3: 2-[(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)amino]ethanol trihydrochloride

tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[(2-hydroxyethyl)amino]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate (73.0 mg, 0.123 mmol) was dissolved in DCM (1 mL). 4M HCl/dioxane (1 mL) was added to the minute and stirred at room temperature for 3.5 hours. The mixture was concentrated and solidified with ether. The precipitated solids were collected by filtration and washed with ether to afford desired product (61.2 mg, 82.6%) as yellow solid.

400 MHz ¹H-NMR (DMSO-d₆) δ: 8.83 (br s, 2H), 8.35 (d, J=8.2 Hz, 1H), 8.14 (dd, J=6.2 Hz and 1.6 Hz, 1H), 7.97 (d, J=8.7 Hz, 1H), 7.90-7.82 (m, 1H), 7.78-7.72 (m, 2H), 7.71-7.65 (m, 2H), 7.52-7.32 (m, 2H), 7.26 (t, J=7.6 Hz, 1H), 6.92-6.75 (m, 1H), 6.87 (t, J=6.9 Hz, 1H), 3.61 (t, J=6.0 Hz, 2H), 3.20 (t, J=6.0 Hz, 2H), 2.74-2.53 (m, 4H), 2.29-2.17 (m, 1H), 1.92-1.80 (m, 1H); LCMS [M+H]: 492.

Example 45 Synthesis of 1-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imdazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpyrrolidine-3-carboxamide trihydrochloride

Step 1: 1-(3-Bromophenyl)pyrrolidine-3-carboxylic acid

1M NaOH aq. (2 mL) was added to a solution of methyl 1-(3-bromophenyl)pyrrolidine-3-carboxylate in THF-MeOH (1 mL-1 mL). After stirring the mixture at room temperature for 13 hours, the mixture was concentrated. The residue was diluted with 1M NaOH aq. and washed with ether. The aqueous layer was acidified with 1M HCl aq. and extracted with DCM (3×). The combined organic layer was dried over anhydrous Na₂SO₄ and concentrated to afford desired product (293 mg, 83.9%) as yellow solid.

500 MHz ¹H-NMR (CDCl₃) δ: 7.05 (t, J=7.9 Hz, 1H), 6.82-6.77 (m, 1H), 6.67 (t, J=2.0 Hz, 1H), 6.45 (dd, J=7.9, 2.0 Hz, 1H), 3.58-3.47 (m, 2H), 3.43-3.35 (m, 1H), 3.34-3.18 (m, 2H), 2.37-2.22 (m, 2H); LCMS: 272 [M+H].

Step 2: 1-(3-Bromophenyl)-N,N-dimethylpyrrolidine-3-carboxamide

Oxalyl chloride (104 μL, 1.19 mmol) was added to a mixture of 1-(3-bromophenyl)pyrrolidine-3-carboxylic acid (293 mg, 1.08 mmol) and N,N-dimethylformamide (8.4 μL, 0.108 mmol) in DCE (5 mL). After heating the mixture at 65° C. for 2 hours, the mixture was coevaporated with toluene. The residue was diluted with THF (5 mL) and Me₂NH (2M/THF, 2.71 mL, 5.42 mmol) was added to the mixture at 0° C. After stirring the mixture for 16 hours at room temperature, the mixture was concentrated and the residue was diluted with water and extracted with EtOAc (3×). The combined organic layers were dried over anhydrous Na₂SO₄ and concentrated. The residue was purified by silica gel column chromatography (EtOAc/hexane=9:1→4:1→2:1) to afford desired product (168 mg, 48.0%) as orange oil.

400 MHz ¹H-NMR (CDCl₃) δ: ¹H-NMR (CDCl₃) δ: 7.05 (t, J=7.9 Hz, 1H), 6.80-6.75 (m, 1H), 6.68 (t, J=2.3 Hz, 1H), 6.46 (dd, J=7.9, 2.3 Hz, 1H), 3.56-3.28 (m, 5H), 3.12 (s, 3H), 2.99 (s, 3H), 2.38-2.16 (m, 2H); LCMS: 297 [M+H].

Step 3: N,N-Dimethyl-1-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]pyrrolidine-3-carboxamide

400 MHz ¹H-NMR (CDCl₃) δ: 7.24 (t, J=7.8 Hz, 1H), 7.17-7.11 (m, 1H), 7.04-6.98 (m, 1H), 6.72-6.63 (m, 1H), 3.60 (t, J=8.7 Hz, 1H), 3.53-3.45 (m, 2H), 3.44-3.32 (m, 2H), 3.12 (s, 3H), 2.99 (s, 3H), 2.39-2.28 (m, 1H), 2.24-2.14 (m, 1H), 1.33 (s, 12H); LCMS: 345 [M+H].

Step 4: tert-Butyl (1-{4-[2-(2-aminopyridin-3-yl)-5-{3-[3-(dimethylcarbamoyl) pyrrolidin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-3-yl]phenyl}cyclobutyl)carbamate

400 MHz ¹H-NMR (CDCl₃) δ: 8.12-8.01 (m, 1H), 8.09 (d, J=8.2 Hz, 1H), 7.78 (d, J=8.2 Hz, 1H), 7.65-7.50 (m, 2H), 7.48-7.39 (m, 2H), 7.37-7.31 (m, 1H), 7.30-7.21 (m, 2H), 7.19-7.11 (m, 1H), 6.64 (br s, 2H), 6.62-6.55 (m, 1H), 6.40-6.31 (m, 1H), 5.37 (br s, 1H), 3.66-3.33 (m, 5H), 3.14 (s, 3H), 3.01 (s, 3H), 2.71-2.09 (m, 7H), 2.01-1.72 (m, 1H), 1.39 (br s, 9H); LCMS: 673 [M+H].

Step 5: 1-(3-{3-[4-(1-Aminocyclobutyl)phenyl]-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl}phenyl)-N,N-dimethylpyrrolidine-3-carboxamide trihydrochloride

400 MHz ¹H-NMR (DMSO-d₆) δ: 8.83 (br s, 2H), 8.33 (d, J=8.7 Hz, 1H), 8.15 (dd, J=6.2, 1.6 Hz, 1H), 8.05 (d, J=8.2 Hz, 1H), 7.93-7.86 (m, 1H), 7.78-7.72 (m, 2H), 7.72-7.67 (m, 2H), 7.32-7.19 (m, 3H), 6.92-6.85 (m, 1H), 6.65-6.59 (m, 1H), 3.60-3.28 (m, 5H), 3.10 (s, 3H), 2.86 (s, 3H), 2.72-2.54 (m, 4H), 2.29-2.16 (m, 2H), 2.14-2.02 (m, 1H), 1.92-1.78 (m, 1H); LCMS: 573 [M+H].

Example 46 Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(methylsulfonyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride Step 1: Synthesis of 1-(methylsulfonyl)-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperazine

1-(Methylsulfonyl)-4-[3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]piperazine was synthesized by the procedure H (Step 1 and 2).

¹H-NMR (400 MHz, CDCl₃) δ: 7.40-7.36 (2H, m), 7.30 (1H, t, J=7.8 Hz), 7.04 (1H, ddd, J=7.8, 2.8, 1.4 Hz), 3.41-3.35 (4H, m), 3.34-3.28 (4H, m), 2.83 (3H, s), 1.34 (12H, s). LCMS: 367 [M+H].

Step 2: Synthesis of 3-(3-[4-(1-aminocyclobutyl)phenyl]-5-{3-[4-(methylsulfonyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride

3-(3-[4-(1-Aminocyclobutyl)phenyl]-5-{3-[4-(methylsulfonyl)piperazin-1-yl]phenyl}-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine hydrochloride was synthesized by the procedures of G and B.

¹H-NMR (400 MHz, DMSO-d₆) δ: 9.01-8.84 (m, 3H), 8.54-8.32 (m, 2H), 8.16 (dd, 1H, J=6.2, 1.6 Hz), 8.09 (d, 1H, J=8.7 Hz), 7.90 (dd, 1H, J=7.6, 1.6 Hz), 7.77 (d, 2H, J=8.7 Hz), 7.72-7.64 (m, 3H), 7.54 (d, 1H, J=8.0 Hz), 7.35 (t, 1H, J=8.0 Hz), 7.07 (dd, 1H, J=8.0, 2.3 Hz), 6.90 (dd, 1H, J=7.6, 6.2 Hz), 3.36-3.26 (m, 8H), 2.95 (s, 3H), 2.70-2.57 (m, 4H), 2.30-2.16 (m, 1H), 1.92-1.79 (m, 1H). LCMS: 595 [M+H].

Example 47 Inactive Akt Alpha Screen Assay

AKT1 activity was assayed using the GSK3-derived biotinylated peptide substrate, crosstide (biotin-GRPRTSSFAEG), and AlphaScreen™ (Amplified Luminescent Proximity Homogeneous Assay) technology. AKT1 activation was achieved by the addition of the activating kinases PDK1 and MAPKAPK2, lipid vesicles, and ATP. The extent of peptide phosphorylation was determined using a phospho-AKT substrate antibody and acceptor beads conjugated to Protein A and donor beads conjugated to streptavidin that bind to the biotin on the peptide. Excitation of the donor beads converted ambient oxygen to excited singlet oxygen which, when in close proximity to acceptor beads, reacted with acceptor beads resulting in signal amplification.

Test inhibitors and controls ((S)-1-(5-(3-methyl-1H-indazol-5-yl)pyridin-3-yl)oxy)-3-phenylpropan-2-amine, 1-(1-(4-(7-phenyl-1H-imidazo[4,5-g]quinoxalin-6-yl)benzyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one, and 8-(4-(1-aminocyclobutyl)phenyl)-9-phenyl-[1,2,4]-triazolo[3,4-f][1,6]naphthyridin-3(2H)-one) were prepared in 10% DMSO at 10-fold the desired final concentration, and added to each well of a reaction plate (Corning 96-well half-area solid white nonbinding surface plate) in a volume of 2.5 μl. Full-length inactive AKT1 was diluted in assay buffer (50 mM Tris, pH 8.0, 0.02 mg/mL BSA, 10 mM MgCl₂, 1 mM EGTA, 10% glycerol, 0.2 mM Na₃VO₄, 1 mM DTT, 0.1 mM β-glycerophosphate, and 0.2 mM NaF) and added to each well in a volume of 17.5 μL for a final concentration in the 25 μL reaction of 8 nM (Akt1). After a 20 minute pre-incubation at room temperature, the kinase reaction was initiated by the addition of 5 μM of an activation mixture diluted in assay buffer containing biotinylated crosstide, PDK1, MAPKAPK2, DOPS/DOPC, PtdIns(3,4,5)P3, and ATP for final concentrations of 60 nM biotinylated crosstide, 0.1 nM PDK1, 0.7 nM MK2, 5.5 μM DOPS, 5.5 μM DOPC, 0.5 μM PtdIns(3,4,5)P3, and 50 μM ATP. The plates were incubated for 30 minutes at room temperature, and then stopped in the dark by the addition of 10 μL stop/detection mixture prepared in assay buffer containing EDTA, AlphaScreen™ Streptavidin Donor and Protein A Acceptor beads, and phospho-AKT substrate antibody for final concentrations of 10 mM EDTA, 500 ng/well of both AlphaScreen™ Streptavidin Donor beads and Protein A Acceptor beads, and phospho-AKT substrate antibody at a final dilution of 1:350. Assay plates were incubated for 90 minutes at room temperature in the dark, and the plates were read on a Perkin Elmer Envision Multilabel plate reader (excitation wavelength: 640 nm, emission wavelength: 570 nm).

Reaction:

-   -   2.5 μL 10× Akt inhibitor in 10% DMSO     -   17.5 μL inactive Akt or buffer for blank     -   20 minute pre-incubation at room temperature     -   5 μL Reaction Mix (5×ATP, 5× substrate, 5×PDK1, 5×MK2, and 5×         lipid vesicle mixture)     -   30 minute incubation at room temperature     -   10 μL Detection Buffer     -   90 minute incubation at room temperature     -   Detection (excitation: 640 nm, emission: 570 nm)

Envision Instrument Settings:

-   -   Instrument: Perkin Elmer Envision     -   Plate: 96 well     -   Program Name:     -   Excitation: Ex Top     -   Mirror: General Dual—Slot 2     -   Excitation Filter: CFP430 Ex. Slot 2     -   Emission Filter Emission 579—Em slot 2     -   2nd Emission Filter: None     -   Measurement Height (mm): 3.8     -   Excitation light (%): 1     -   Detector gain: 1     -   2nd detector gain: 0     -   # Flashes: 10     -   # Flashed/AD: 1     -   Reference Signal: 383722     -   AD gain: 4     -   Reference Excitation (%): 100

Example 48 MTS Assay

Cell proliferation analysis. Cell survival was determined by the MTS assay. Briefly, cells were plated in a 96-well plate at 2,000-10,000 cells per well, cultured for 24 hours in complete growth medium, and then treated with various drugs and drug combinations for 72 hours. MTS was added and incubated for 4 hour, followed by assessment of cell viability using the microplate reader at 570 nm. Data were normalized to untreated controls and analyzed with Microsoft Excel.

Example 49 Thermal Shift Assay

Binding analysis. Protein-ligand binding was identified with the thermal shift assay which is based on the ligand-induced stabilization of the protein tertiary structure. The thermal stability of the ligand-Akt1 complex was assessed by subjecting the complex to a set temperature gradient and by comparison of the meltion temperature of the Akt1-ligand complex with the melting temperature of the protein alone. Protein unfolding was monitored by the fluorescence readout of an environmentally sensitive fluorescent dye, 1-anilinonaphthalene-8-sulfonic acid (ANS). Protein-ligand mixture containing 15 μM compound, 200 ng/mL full length inactive Akt1, 200 μM ANS in the binding buffer (25 mM Tris-HCl (pH. 7.5), 100 mM NaCl, 10% Glycerol, and 5 mM DTT) was prepared in a PCR plate. The PCR plate was placed into a RT-PCR instrument and a temperature gradient was performed, increasing from 27 to 80° C., at 1° C./30 sec heat rate with a dwell time of 20 sec. The change in ANS fluorescence was measured using the filter set of 475 nm/525 nm excitation/emission. Ligand affinity parameter (Kd) at 25° C. was calculated using constant ligand binding enthalpy

H=−15 kcal/mol.

Example 50 Cell ELISA Assay

Phospho-Akt detection analysis. Phospho-Akt (S473) was detected using cell ELISA. Briefly, cells were plated in a 96-well plate at 7,000-10,000 cells per well, cultured for 2-3 days in complete growth medium, and then treated with various drugs or combinations of drugs for 1 hour. The cells were fixed with ice-cold methanol, and washed with TBS supplemented with 1% H₂O₂. Phospho-Akt (S473) was probed with corresponding rabbit antibody as a primary antibody, and horseradish peroxidase conjugated goat anti-rabbit IgG. After treatment with SuperSignal® ELISA for 15 minutes, the detection was performed using a luminometer. Data were normalized to untreated controls and analyzed with Microsoft Excel.

Example 51 ATP Quantitation Assay

Cell viability analysis. Cell viability was determined by the ATP quantitation assay. Briefly, cells were plated in a 96-well plate at 2,000-10,000 cells per well, cultured for 24 hours in complete growth medium, and then treated with various drugs or combination of drugs for 72 hours. CellTiter-Glo® reagent was added and incubated at room temperature for 10 minutes, followed by assessment of cell viability using a luminometer. Data were normalized to untreated controls and analyzed with Microsoft Excel.

Table 2 shows the physical and biological properties of representative compounds of the present invention.

TABLE 2 Thermal Cell Shift Elisa Akt1 biochemical assay IC₅₀ Cmpd Kd (nM) (nM) GI₅₀ (μM) AlphaScreen crosstide (μM) 1 N.A. 235 N.T. 3 7 29 444 0.00309 4 0.4 17 265 0.0017 5 0.7 0.00446 6 1.4 0.00163 7 7.1 12 836 0.00245 8 1.2 8 1348 0.0015 9 0.2 2.1 0.00251 10 0.2 3.0 0.00415 11 0.2 1.7 0.00336 12 0.2 0.00144 13 1.4 9 335 0.00215 14 1.1 11 296 0.00184 15 1.1 4.0 16 1.7 0.00342 17 3.1 0.00436 18 0.8 0.00179 19 N.A. 60 1423 0.00377 20 57.3 414 N.T. 0.00872 21 109.5 605 22 83.1 

The invention claimed is:
 1. A compound of formula I:

or a pharmaceutically acceptable salt or ester thereof, wherein: X is NR_(N)R_(N)′ or

 wherein

 is linked to the imidazopyridinyl ring of formula I at the position indicated by “**”; R_(N) is C₆-C₁₀ aryl substituted with unsubstituted or substituted heterocycle comprising one 5- or 6-member ring and 1-3 heteroatoms selected from N, O and S; R_(N)′ is H; or R_(N) and R_(N)′, together with the nitrogen atom to which they are attached, form an unsubstituted or substituted morpholine; and R_(ph) is substituted C₃-C₆ alkyl or unsubstituted C₄-C₆ alkyl.
 2. The compound of claim 1, selected from the group consisting of:

or a pharmaceutically acceptable salt or ester thereof.
 3. The compound of claim 1, wherein X is NR_(N)R_(N)′; and R_(N) is C₆-C₁₀ aryl substituted with unsubstituted or substituted heterocycle selected from pyrrolidinyl, imidazolidinyl, pyrazolidinyl, oxazolidinyl, isoxazolidinyl, triazolidinyl, tetrahyrofuranyl, piperidinyl, piperazinyl, and morpholinyl.
 4. The compound of claim 3, wherein the heterocycle is morpholinyl.
 5. The compound of claim 1, wherein X is NR_(N)R_(N)′; and R_(N) and R_(N)′, together with the nitrogen atom to which they are attached, form an unsubstituted morpholine or a morpholine substituted with a substituent selected from the group consisting of hydroxyl, halogen, cyano, nitro, unsubstituted or substituted amino, unsubstituted or substituted C₁-C₆ alkyl, and unsubstituted or substituted C₁-C₆ alkoxy.
 6. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 1, or a salt or ester thereof, and a pharmaceutically acceptable carrier or excipient. 